1
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Fehre K, Novikovskiy NM, Grundmann S, Kastirke G, Eckart S, Trinter F, Rist J, Hartung A, Trabert D, Janke C, Nalin G, Pitzer M, Zeller S, Wiegandt F, Weller M, Kircher M, Hofmann M, Schmidt LPH, Knie A, Hans A, Ltaief LB, Ehresmann A, Berger R, Fukuzawa H, Ueda K, Schmidt-Böcking H, Williams JB, Jahnke T, Dörner R, Schöffler MS, Demekhin PV. Fourfold Differential Photoelectron Circular Dichroism. Phys Rev Lett 2021; 127:103201. [PMID: 34533326 DOI: 10.1103/physrevlett.127.103201] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 08/08/2021] [Indexed: 06/13/2023]
Abstract
We report on a joint experimental and theoretical study of photoelectron circular dichroism (PECD) in methyloxirane. By detecting O 1s photoelectrons in coincidence with fragment ions, we deduce the molecule's orientation and photoelectron emission direction in the laboratory frame. Thereby, we retrieve a fourfold differential PECD clearly beyond 50%. This strong chiral asymmetry is reproduced by ab initio electronic structure calculations. Providing such a pronounced contrast makes PECD of fixed-in-space chiral molecules an even more sensitive tool for chiral recognition in the gas phase.
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Affiliation(s)
- K Fehre
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - N M Novikovskiy
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, Kassel 34132, Germany
- Institute of Physics, Southern Federal University, Rostov-on-Don 344090, Russia
| | - S Grundmann
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - G Kastirke
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - S Eckart
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - F Trinter
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin 14195, Germany
| | - J Rist
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - A Hartung
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - D Trabert
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - C Janke
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - G Nalin
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - M Pitzer
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - S Zeller
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - F Wiegandt
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - M Weller
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - M Kircher
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - M Hofmann
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - L Ph H Schmidt
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - A Knie
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, Kassel 34132, Germany
| | - A Hans
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, Kassel 34132, Germany
| | - L Ben Ltaief
- Department of Physics and Astronomy, Aarhus University, Århus 8000, Denmark
| | - A Ehresmann
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, Kassel 34132, Germany
| | - R Berger
- Theoretical Chemistry, Universität Marburg, Hans-Meerwein-Strasse 4, Marburg 35032, Germany
| | - H Fukuzawa
- Institute of multidisciplinary research for advanced materials, Tohoku University, Sendai 980-8577, Japan
| | - K Ueda
- Institute of multidisciplinary research for advanced materials, Tohoku University, Sendai 980-8577, Japan
| | - H Schmidt-Böcking
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - J B Williams
- Department of Physics, University of Nevada, Reno, Nevada 89557, USA
| | - T Jahnke
- European XFEL, Holzkoppel 4, Schenefeld 22869, Germany
| | - R Dörner
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - M S Schöffler
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
| | - Ph V Demekhin
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, Kassel 34132, Germany
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2
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Fehre K, Pitzer M, Trinter F, Berger R, Schießer A, Schmidt-Böcking H, Dörner R, Schöffler MS. Closed-loop recycling of rare liquid samples for gas-phase experiments. Rev Sci Instrum 2021; 92:023205. [PMID: 33648096 DOI: 10.1063/5.0037836] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
Many samples of current interest in molecular physics and physical chemistry exist in the liquid phase and are vaporized for use in gas cells, diffuse gas targets, or molecular gas jets. For some of these techniques, the large sample consumption is a limiting factor. When rare, expensive molecules such as custom-made chiral molecules or species with isotopic labels are used, wasting them in the exhaust line of the pumps is quite an expensive and inefficient approach. Therefore, we developed a closed-loop recycling system for molecules with vapor pressures below atmospheric pressure. Once filled, only a few valves have to be adjusted, and a cold trap must be moved after each phase of recycling. The recycling efficiency per turn exceeds 95%.
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Affiliation(s)
- K Fehre
- Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M Pitzer
- Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - F Trinter
- Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - R Berger
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35039 Marburg, Germany
| | - A Schießer
- Mass Spectrometry, Department of Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287 Darmstadt, Germany
| | - H Schmidt-Böcking
- Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - R Dörner
- Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M S Schöffler
- Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
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3
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Sann H, Schober C, Mhamdi A, Trinter F, Müller C, Semenov SK, Stener M, Waitz M, Bauer T, Wallauer R, Goihl C, Titze J, Afaneh F, Schmidt LPH, Kunitski M, Schmidt-Böcking H, Demekhin PV, Cherepkov NA, Schöffler MS, Jahnke T, Dörner R. Delocalization of a Vacancy across Two Neon Atoms Bound by the van der Waals Force. Phys Rev Lett 2016; 117:263001. [PMID: 28059541 DOI: 10.1103/physrevlett.117.263001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Indexed: 06/06/2023]
Abstract
We experimentally study 2p photoionization of neon dimers (Ne_{2}) at a photon energy of hν=36.56 eV. By postselection of ionization events which lead to a dissociation into Ne^{+}+Ne we obtain the photoelectron angular emission distribution in the molecular frame. This distribution is symmetric with respect to the direction of the charged vs neutral fragment. It shows an inverted Cohen-Fano double slit interference pattern of two spherical waves emitted coherently but with opposite phases from the two atoms of the dimer.
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Affiliation(s)
- H Sann
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - C Schober
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - A Mhamdi
- Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology, Universität Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany
| | - F Trinter
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - C Müller
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - S K Semenov
- State University of Aerospace Instrumentation, 190000, St. Petersburg, Russia
| | - M Stener
- Dipartimento di Scienze Chimiche, Universita di Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy
| | - M Waitz
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - T Bauer
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - R Wallauer
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - C Goihl
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - J Titze
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - F Afaneh
- Physics Department, The Hashemite University, Zarqa 13133, Jordan
| | - L Ph H Schmidt
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M Kunitski
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - H Schmidt-Böcking
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - Ph V Demekhin
- Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology, Universität Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany
| | - N A Cherepkov
- State University of Aerospace Instrumentation, 190000, St. Petersburg, Russia
| | - M S Schöffler
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - T Jahnke
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - R Dörner
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
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4
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Sann H, Havermeier T, Müller C, Kim HK, Trinter F, Waitz M, Voigtsberger J, Sturm F, Bauer T, Wallauer R, Schneider D, Weller M, Goihl C, Tross J, Cole K, Wu J, Schöffler MS, Schmidt-Böcking H, Jahnke T, Simon M, Dörner R. Imaging the Temporal Evolution of Molecular Orbitals during Ultrafast Dissociation. Phys Rev Lett 2016; 117:243002. [PMID: 28009186 DOI: 10.1103/physrevlett.117.243002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Indexed: 05/23/2023]
Abstract
We investigate the temporal evolution of molecular frame angular distributions of Auger electrons emitted during ultrafast dissociation of HCl following a resonant single-photon excitation. The electron emission pattern changes its shape from that of a molecular σ orbital to that of an atomic p state as the system evolves from a molecule into two separated atoms.
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Affiliation(s)
- H Sann
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - T Havermeier
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - C Müller
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - H-K Kim
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - F Trinter
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - M Waitz
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - J Voigtsberger
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - F Sturm
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - T Bauer
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - R Wallauer
- Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany
| | - D Schneider
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - M Weller
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - C Goihl
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - J Tross
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - K Cole
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - J Wu
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - M S Schöffler
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - H Schmidt-Böcking
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - T Jahnke
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
| | - M Simon
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - R Dörner
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
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5
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Waitz M, Metz D, Lower J, Schober C, Keiling M, Pitzer M, Mertens K, Martins M, Viefhaus J, Klumpp S, Weber T, Schmidt-Böcking H, Schmidt LPH, Morales F, Miyabe S, Rescigno TN, McCurdy CW, Martín F, Williams JB, Schöffler MS, Jahnke T, Dörner R. Two-Particle Interference of Electron Pairs on a Molecular Level. Phys Rev Lett 2016; 117:083002. [PMID: 27588854 DOI: 10.1103/physrevlett.117.083002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 06/06/2023]
Abstract
We investigate the photodouble ionization of H_{2} molecules with 400 eV photons. We find that the emitted electrons do not show any sign of two-center interference fringes in their angular emission distributions if considered separately. In contrast, the quasiparticle consisting of both electrons (i.e., the "dielectron") does. The work highlights the fact that nonlocal effects are embedded everywhere in nature where many-particle processes are involved.
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Affiliation(s)
- M Waitz
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - D Metz
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - J Lower
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - C Schober
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M Keiling
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M Pitzer
- Universität Kassel, Heinr.-Plett-Straße 40, 34132 Kassel, Germany
| | - K Mertens
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M Martins
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - J Viefhaus
- FS-PE, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - S Klumpp
- FS-FL, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - T Weber
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - H Schmidt-Böcking
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - L Ph H Schmidt
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - F Morales
- Max-Born-Institut, Max Born Strasse 2 A, D-12489 Berlin, Germany
| | - S Miyabe
- Attosecond Science Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - T N Rescigno
- Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - C W McCurdy
- Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Chemistry, University of California, Davis, California 95616, USA
| | - F Martín
- Departamento de Química, Universidad Autonoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autonoma de Madrid, 28049 Madrid, Spain
| | - J B Williams
- Department of Physics, University of Nevada Reno, 1664 North Virginia Street Reno, Nevada 89557, USA
| | - M S Schöffler
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - T Jahnke
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - R Dörner
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
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6
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Gassert H, Chuluunbaatar O, Waitz M, Trinter F, Kim HK, Bauer T, Laucke A, Müller C, Voigtsberger J, Weller M, Rist J, Pitzer M, Zeller S, Jahnke T, Schmidt LPH, Williams JB, Zaytsev SA, Bulychev AA, Kouzakov KA, Schmidt-Böcking H, Dörner R, Popov YV, Schöffler MS. Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact. Phys Rev Lett 2016; 116:073201. [PMID: 26943532 DOI: 10.1103/physrevlett.116.073201] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Indexed: 06/05/2023]
Abstract
Even though the study of ion-atom collisions is a mature field of atomic physics, large discrepancies between experiment and theoretical calculations are still common. Here we present experimental results with high momentum resolution on the single ionization of helium induced by 1-MeV protons, and we compare these to theoretical calculations. The overall agreement is strikingly good, and even the first Born approximation yields good agreement between theory and experiment. This has been expected for several decades, but so far has not been accomplished. The influence of projectile coherence effects on the measured data is briefly discussed in terms of an ongoing dispute on the existence of nodal structures in the electron angular emission distributions.
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Affiliation(s)
- H Gassert
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - O Chuluunbaatar
- Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia
- Institute of Mathematics, National University of Mongolia, 210646 Ulaanbaatar, Mongolia
| | - M Waitz
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - F Trinter
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - H-K Kim
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - T Bauer
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - A Laucke
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - Ch Müller
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - J Voigtsberger
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - M Weller
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - J Rist
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - M Pitzer
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - S Zeller
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - T Jahnke
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - L Ph H Schmidt
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - J B Williams
- Department of Physics, University of Nevada, Reno, Nevada 89557, USA
| | - S A Zaytsev
- Department of Physics, Pacific State University, Tikhookeanskaya 136, Khabarovsk 680035, Russia
| | - A A Bulychev
- Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia
| | - K A Kouzakov
- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - H Schmidt-Böcking
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - R Dörner
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - Yu V Popov
- Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - M S Schöffler
- Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
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7
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Schmidt LPH, Lower J, Jahnke T, Schößler S, Schöffler MS, Menssen A, Lévêque C, Sisourat N, Taïeb R, Schmidt-Böcking H, Dörner R. Momentum transfer to a free floating double slit: realization of a thought experiment from the Einstein-Bohr debates. Phys Rev Lett 2013; 111:103201. [PMID: 25166663 DOI: 10.1103/physrevlett.111.103201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 06/04/2013] [Indexed: 06/03/2023]
Abstract
We simultaneously measured the momentum transferred to a free-floating molecular double slit and the momentum change of the atom scattering from it. Our experimental results are compared to quantum mechanical and semiclassical models. The results reveal that a classical description of the slits, which was used by Einstein in his debate with Bohr, provides a surprisingly good description of the experimental results, even for a microscopic system, if momentum transfer is not ascribed to a specific pathway but shared coherently and simultaneously between both.
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Affiliation(s)
- L Ph H Schmidt
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - J Lower
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - T Jahnke
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - S Schößler
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - M S Schöffler
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - A Menssen
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - C Lévêque
- Laboratoire de Chimie Physique-Matière et Rayonnement, Université Pierre et Marie Curie, 11 Rue Pierre et Marie Curie, 75231 Paris 05, France
| | - N Sisourat
- Laboratoire de Chimie Physique-Matière et Rayonnement, Université Pierre et Marie Curie, 11 Rue Pierre et Marie Curie, 75231 Paris 05, France
| | - R Taïeb
- Laboratoire de Chimie Physique-Matière et Rayonnement, Université Pierre et Marie Curie, 11 Rue Pierre et Marie Curie, 75231 Paris 05, France
| | - H Schmidt-Böcking
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - R Dörner
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
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8
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Schöffler MS, Stuck C, Waitz M, Trinter F, Jahnke T, Lenz U, Jones M, Belkacem A, Landers AL, Pindzola MS, Cocke CL, Colgan J, Kheifets A, Bray I, Schmidt-Böcking H, Dörner R, Weber T. Ejection of quasi-free-electron pairs from the helium-atom ground state by single-photon absorption. Phys Rev Lett 2013; 111:013003. [PMID: 23862999 DOI: 10.1103/physrevlett.111.013003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Indexed: 06/02/2023]
Abstract
We investigate the single-photon double ionization of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to electrons emitted back to back with equal energy. These slow ions are the unique fingerprint of an elusive quasifree photon double ionization mechanism predicted by Amusia et al. nearly four decades ago [J. Phys. B 8, 1248 (1975)]. It results from the nondipole part of the electromagnetic interaction. Our experimental data are supported by calculations performed using the convergent close-coupling and time-dependent close-coupling methods.
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Affiliation(s)
- M S Schöffler
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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9
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Trinter F, Schmidt L, Jahnke T, Schöffler M, Jagutzki O, Czasch A, Lower J, Isaev T, Berger R, Landers A, Weber T, Dörner R, Schmidt-Böcking H. Multi-fragment vector correlation imaging. A search for hidden dynamical symmetries in many-particle molecular fragmentation processes. Mol Phys 2012. [DOI: 10.1080/00268976.2012.686642] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Schmidt LPH, Jahnke T, Czasch A, Schöffler M, Schmidt-Böcking H, Dörner R. Spatial imaging of the H2(+) vibrational wave function at the quantum limit. Phys Rev Lett 2012; 108:073202. [PMID: 22401202 DOI: 10.1103/physrevlett.108.073202] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Indexed: 05/31/2023]
Abstract
We experimentally obtained a direct image of the nuclear wave functions of H(2)(+) by dissociating the molecule via electron attachment and determining the vibrational state using the cold target recoil ion momentum spectroscopy technique. Our experiment visualizes the nodal structure of different vibrational states. We compare our results to the widely used reflection approximation and to quantum simulations and discuss the limits of position measurements in molecules imposed by the uncertainty principle.
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Affiliation(s)
- L Ph H Schmidt
- Institut für Kernphysik, Goethe-Universität, Frankfurt am Main, Germany.
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11
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Sann H, Jahnke T, Havermeier T, Kreidi K, Stuck C, Meckel M, Schöffler MS, Neumann N, Wallauer R, Voss S, Czasch A, Jagutzki O, Weber T, Schmidt-Böcking H, Miyabe S, Haxton DJ, Orel AE, Rescigno TN, Dörner R. Electron diffraction self-imaging of molecular fragmentation in two-step double ionization of water. Phys Rev Lett 2011; 106:133001. [PMID: 21517378 DOI: 10.1103/physrevlett.106.133001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Indexed: 05/30/2023]
Abstract
We doubly ionize H(2)O by single photon absorption at 43 eV leading to H(+) + OH(+). A direct double ionization and a sequential process in which single ionization is followed by rapid dissociation into a proton and an autoionizing OH(*) are identified. The angular distribution of this delayed autoionization electron shows a preferred emission in the direction of the emitted proton. From this diffraction feature we obtain internuclear distances of 700 to 1100 a.u. at which the autoionization of the OH(*) occurs. The experimental findings are in line with calculations of the excited potential energy surfaces and their lifetimes.
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Affiliation(s)
- H Sann
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
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12
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Titze J, Schöffler MS, Kim HK, Trinter F, Waitz M, Voigtsberger J, Neumann N, Ulrich B, Kreidi K, Wallauer R, Odenweller M, Havermeier T, Schössler S, Meckel M, Foucar L, Jahnke T, Czasch A, Schmidt LPH, Jagutzki O, Grisenti RE, Schmidt-Böcking H, Lüdde HJ, Dörner R. Ionization dynamics of helium dimers in fast collisions with He++. Phys Rev Lett 2011; 106:033201. [PMID: 21405271 DOI: 10.1103/physrevlett.106.033201] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Indexed: 05/30/2023]
Abstract
By employing the cold target recoil ion momentum spectroscopy technique, we have investigated the (He+, He+) breakup of a helium dimer (He2) caused by transfer ionization and double capture in collisions with alpha particles (E = 150 keV/u). Surprisingly, the results show a two-step process as well as a one-step process followed by electron exchange. In addition, interatomic Coulombic decay [L. S. Cederbaum, J. Zobeley, and F. Tarantelli, Phys. Rev. Lett. 79, 4778 (1997).] is observed in an ion collision for the first time.
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Affiliation(s)
- J Titze
- Institut für Kernphysik, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str 1, 60438 Frankfurt, Germany
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13
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Havermeier T, Jahnke T, Kreidi K, Wallauer R, Voss S, Schöffler M, Schössler S, Foucar L, Neumann N, Titze J, Sann H, Kühnel M, Voigtsberger J, Malakzadeh A, Sisourat N, Schöllkopf W, Schmidt-Böcking H, Grisenti RE, Dörner R. Single photon double ionization of the helium dimer. Phys Rev Lett 2010; 104:153401. [PMID: 20481987 DOI: 10.1103/physrevlett.104.153401] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Indexed: 05/29/2023]
Abstract
We show that a single photon can ionize the two helium atoms of the helium dimer in a distance up to 10 A. The energy sharing among the electrons, the angular distributions of the ions and electrons, as well as comparison with electron impact data for helium atoms suggest a knockoff type double ionization process. The Coulomb explosion imaging of He2 provides a direct view of the nuclear wave function of this by far most extended and most diffuse of all naturally existing molecules.
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Affiliation(s)
- T Havermeier
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
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14
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Havermeier T, Jahnke T, Kreidi K, Wallauer R, Voss S, Schöffler M, Schössler S, Foucar L, Neumann N, Titze J, Sann H, Kühnel M, Voigtsberger J, Morilla JH, Schöllkopf W, Schmidt-Böcking H, Grisenti RE, Dörner R. Interatomic Coulombic decay following photoionization of the helium dimer: observation of vibrational structure. Phys Rev Lett 2010; 104:133401. [PMID: 20481883 DOI: 10.1103/physrevlett.104.133401] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Indexed: 05/29/2023]
Abstract
Using synchrotron radiation we simultaneously ionize and excite one helium atom of a helium dimer (He2) in a shakeup process. The populated states of the dimer ion [i.e., He(*+)(n = 2, 3) - He] are found to deexcite via interatomic Coulombic decay. This leads to the emission of a second electron from the neutral site and a subsequent Coulomb explosion. In this Letter we present a measurement of the momenta of fragments that are created during this reaction. The electron energy distribution and the kinetic energy release of the two He+ ions show pronounced oscillations which we attribute to the structure of the vibrational wave function of the dimer ion.
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Affiliation(s)
- T Havermeier
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
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15
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Neumann N, Hant D, Schmidt LPH, Titze J, Jahnke T, Czasch A, Schöffler MS, Kreidi K, Jagutzki O, Schmidt-Böcking H, Dörner R. Fragmentation dynamics of CO(2)(3+) investigated by multiple electron capture in collisions with slow highly charged ions. Phys Rev Lett 2010; 104:103201. [PMID: 20366421 DOI: 10.1103/physrevlett.104.103201] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2009] [Indexed: 05/29/2023]
Abstract
Fragmentation of highly charged molecular ions or clusters consisting of more than two atoms can proceed in a one step synchronous manner where all bonds break simultaneously or sequentially by emitting one ion after the other. We separated these decay channels for the fragmentation of CO(2)(3+) ions by measuring the momenta of the ionic fragments. We show that the total energy deposited in the molecular ion is a control parameter which switches between three distinct fragmentation pathways: the sequential fragmentation in which the emission of an O(+) ion leaves a rotating CO(2+) ion behind that fragments after a time delay, the Coulomb explosion and an in-between fragmentation--the asynchronous dissociation. These mechanisms are directly distinguishable in Dalitz plots and Newton diagrams of the fragment momenta. The CO(2)(3+) ions are produced by multiple electron capture in collisions with 3.2 keV/u Ar(8+) ions.
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Affiliation(s)
- N Neumann
- Institut für Kernphysik, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str.1, 60438 Frankfurt, Germany
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16
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Kreidi K, Demekhin PV, Jahnke T, Weber T, Havermeier T, Liu XJ, Morisita Y, Schössler S, Schmidt LPH, Schöffler M, Odenweller M, Neumann N, Foucar L, Titze J, Ulrich B, Sturm F, Stuck C, Wallauer R, Voss S, Lauter I, Kim HK, Rudloff M, Fukuzawa H, Prümper G, Saito N, Ueda K, Czasch A, Jagutzki O, Schmidt-Böcking H, Scheit S, Cederbaum LS, Dörner R. Photo- and auger-electron recoil induced dynamics of interatomic Coulombic decay. Phys Rev Lett 2009; 103:033001. [PMID: 19659272 DOI: 10.1103/physrevlett.103.033001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2009] [Indexed: 05/28/2023]
Abstract
At photon energies near the Ne K edge it is shown that for 1s ionization the Auger electron, and for 2s ionization the fast photoelectron, launch vibrational wave packets in a Ne dimer. These wave packets then decay by emission of a slow electron via interatomic Coulombic decay (ICD). The measured and computed ICD electron spectra are shown to be significantly modified by the recoil induced nuclear motion.
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Affiliation(s)
- K Kreidi
- Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
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17
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Liu XJ, Fukuzawa H, Prümper G, Okunishi M, Shimada K, Ueda K, Motomura K, Saito N, Iwayama H, Nagaya K, Yao M, Rudenko A, Ullrich J, Foucar L, Czasch A, Schmidt-Böcking H, Dörner R, Nagasono M, Higashiya A, Yabashi M, Ishikawa T, Ohashi H, Kimura H. Cold-target recoil-ion momentum spectroscopy for diagnostics of high harmonics of the extreme-ultraviolet free-electron laser light source at SPring-8. Rev Sci Instrum 2009; 80:053105. [PMID: 19485490 DOI: 10.1063/1.3126422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have developed a cold-target recoil-ion momentum spectroscopy apparatus dedicated to the experiments using the extreme-ultraviolet light pulses at the free-electron laser facility, SPring-8 Compact SASE Source test accelerator, in Japan and used it to measure spatial distributions of fundamental, second, and third harmonics at the end station.
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Affiliation(s)
- X-J Liu
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
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18
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Senz V, Fischer T, Oelssner P, Tiggesbäumker J, Stanzel J, Bostedt C, Thomas H, Schöffler M, Foucar L, Martins M, Neville J, Neeb M, Möller T, Wurth W, Rühl E, Dörner R, Schmidt-Böcking H, Eberhardt W, Ganteför G, Treusch R, Radcliffe P, Meiwes-Broer KH. Core-hole screening as a probe for a metal-to-nonmetal transition in lead clusters. Phys Rev Lett 2009; 102:138303. [PMID: 19392409 DOI: 10.1103/physrevlett.102.138303] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Indexed: 05/27/2023]
Abstract
Metal clusters serve as model systems to study basic problems of electronic correlation. Vacuum ultraviolet light from the free-electron laser FLASH ionizes 5d electrons from mass-separated negatively charged clusters, thus transiently leading to core-ionized neutral systems. Shielding of the core hole affects the electron binding energy. From the strong deviation from expectations of the metallic droplet and jellium models we conclude on reduced electronic shielding once the cluster size falls below about 20 atoms. This suggests a metal-to-nonmetal transition, in agreement with previous local density approximation calculations.
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Affiliation(s)
- V Senz
- Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
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19
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Schmidt LPH, Schössler S, Afaneh F, Schöffler M, Stiebing KE, Schmidt-Böcking H, Dörner R. Young-type interference in collisions between hydrogen molecular ions and helium. Phys Rev Lett 2008; 101:173202. [PMID: 18999747 DOI: 10.1103/physrevlett.101.173202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Indexed: 05/27/2023]
Abstract
The dissociative electron transfer from He into 10 keV H2+ was measured in a kinematically complete experiment by using the cold target recoil ion momentum spectroscopy imaging technique in combination with a highly resolving molecular fragment imaging technique. The electron transfer into the dissociative b(3)Sigma+_(u) state of H2 could be selected by kinematic conditions. We find a striking double slit interference pattern in the transverse momentum transfer which we can modify by selecting different internuclear distances. Compared to an optical double slit, interference minima and maxima are interchanged. The latter is the result of a phase shift in the electronic part of the wave function.
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Affiliation(s)
- L Ph H Schmidt
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, Frankfurt am Main, Germany
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20
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Schöffler MS, Titze J, Petridis N, Jahnke T, Cole K, Schmidt LPH, Czasch A, Akoury D, Jagutzki O, Williams JB, Cherepkov NA, Semenov SK, McCurdy CW, Rescigno TN, Cocke CL, Osipov T, Lee S, Prior MH, Belkacem A, Landers AL, Schmidt-Böcking H, Weber T, Dörner R. Ultrafast probing of core hole localization in N2. Science 2008; 320:920-3. [PMID: 18487190 DOI: 10.1126/science.1154989] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Although valence electrons are clearly delocalized in molecular bonding frameworks, chemists and physicists have long debated the question of whether the core vacancy created in a homonuclear diatomic molecule by absorption of a single x-ray photon is localized on one atom or delocalized over both. We have been able to clarify this question with an experiment that uses Auger electron angular emission patterns from molecular nitrogen after inner-shell ionization as an ultrafast probe of hole localization. The experiment, along with the accompanying theory, shows that observation of symmetry breaking (localization) or preservation (delocalization) depends on how the quantum entangled Bell state created by Auger decay is detected by the measurement.
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Affiliation(s)
- M S Schöffler
- Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany.
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21
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Kreidi K, Akoury D, Jahnke T, Weber T, Staudte A, Schöffler M, Neumann N, Titze J, Schmidt LPH, Czasch A, Jagutzki O, Costa Fraga RA, Grisenti RE, Smolarski M, Ranitovic P, Cocke CL, Osipov T, Adaniya H, Thompson JC, Prior MH, Belkacem A, Landers AL, Schmidt-Böcking H, Dörner R. Interference in the collective electron momentum in double photoionization of H2. Phys Rev Lett 2008; 100:133005. [PMID: 18517946 DOI: 10.1103/physrevlett.100.133005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Indexed: 05/26/2023]
Abstract
We investigate single-photon double ionization of H(2) by 130 to 240 eV circularly polarized photons. We find a double slitlike interference pattern in the sum momentum of both electrons in the molecular frame which survives integration over all other degrees of freedom. The difference momentum and the individual electron momentum distributions do not show such a robust interference pattern. We show that this interference results from a non-Heitler-London fraction of the H(2) ground state where both electrons are at the same atomic center.
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Affiliation(s)
- K Kreidi
- Institut für Kernphysik, J.W. Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany
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22
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Akoury D, Kreidi K, Jahnke T, Weber T, Staudte A, Schöffler M, Neumann N, Titze J, Schmidt LPH, Czasch A, Jagutzki O, Costa Fraga RA, Grisenti RE, Díez Muiño R, Cherepkov NA, Semenov SK, Ranitovic P, Cocke CL, Osipov T, Adaniya H, Thompson JC, Prior MH, Belkacem A, Landers AL, Schmidt-Böcking H, Dörner R. The simplest double slit: interference and entanglement in double photoionization of H2. Science 2007; 318:949-52. [PMID: 17991857 DOI: 10.1126/science.1144959] [Citation(s) in RCA: 197] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The wave nature of particles is rarely observed, in part because of their very short de Broglie wavelengths in most situations. However, even with wavelengths close to the size of their surroundings, the particles couple to their environment (for example, by gravity, Coulomb interaction, or thermal radiation). These couplings shift the wave phases, often in an uncontrolled way, and the resulting decoherence, or loss of phase integrity, is thought to be a main cause of the transition from quantum to classical behavior. How much interaction is needed to induce this transition? Here we show that a photoelectron and two protons form a minimum particle/slit system and that a single additional electron constitutes a minimum environment. Interference fringes observed in the angular distribution of a single electron are lost through its Coulomb interaction with a second electron, though the correlated momenta of the entangled electron pair continue to exhibit quantum interference.
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Affiliation(s)
- D Akoury
- Institut für Kernphysik, University Frankfurt, Max von Laue Str 1, D-60438 Frankfurt, Germany
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23
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Jahnke T, Czasch A, Schöffler M, Schössler S, Käsz M, Titze J, Kreidi K, Grisenti RE, Staudte A, Jagutzki O, Schmidt LPH, Weber T, Schmidt-Böcking H, Ueda K, Dörner R. Experimental separation of virtual photon exchange and electron transfer in interatomic coulombic decay of neon dimers. Phys Rev Lett 2007; 99:153401. [PMID: 17995162 DOI: 10.1103/physrevlett.99.153401] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Indexed: 05/25/2023]
Abstract
We investigate the interatomic Coulombic decay (ICD) of neon dimers following photoionization with simultaneous excitation of the ionized atom (shakeup) in a multiparticle coincidence experiment. We find that, depending on the parity of the excited state, which determines whether ICD takes place via virtual dipole photon emission or overlap of the wave functions, the decay happens at different internuclear distances, illustrating that nuclear dynamics heavily influence the electronic decay in the neon dimer.
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Affiliation(s)
- T Jahnke
- Institut für Kernphysik, J. W. Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 1, D-60438 Frankfurt, Germany.
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24
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Martín F, Fernández J, Havermeier T, Foucar L, Weber T, Kreidi K, Schöffler M, Schmidt L, Jahnke T, Jagutzki O, Czasch A, Benis EP, Osipov T, Landers AL, Belkacem A, Prior MH, Schmidt-Böcking H, Cocke CL, Dörner R. Single Photon-Induced Symmetry Breaking of H2 Dissociation. Science 2007; 315:629-33. [PMID: 17272717 DOI: 10.1126/science.1136598] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
H2, the smallest and most abundant molecule in the universe, has a perfectly symmetric ground state. What does it take to break this symmetry? We found that the inversion symmetry can be broken by absorption of a linearly polarized photon, which itself has inversion symmetry. In particular, the emission of a photoelectron with subsequent dissociation of the remaining H+2 fragment shows no symmetry with respect to the ionic H+ and neutral H atomic fragments. This lack of symmetry results from the entanglement between symmetric and antisymmetric H+2 states that is caused by autoionization. The mechanisms behind this symmetry breaking are general for all molecules.
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Affiliation(s)
- F Martín
- Departamento de Química, C-9, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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25
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Czasch A, Schöffler M, Hattass M, Schössler S, Jahnke T, Weber T, Staudte A, Titze J, Wimmer C, Kammer S, Weckenbrock M, Voss S, Grisenti RE, Jagutzki O, Schmidt LPH, Schmidt-Böcking H, Dörner R, Rost JM, Schneider T, Liu CN, Bray I, Kheifets AS, Bartschat K. Partial photoionization cross sections and angular distributions for double excitation of helium up to the N = 13 threshold. Phys Rev Lett 2005; 95:243003. [PMID: 16384373 DOI: 10.1103/physrevlett.95.243003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2004] [Indexed: 05/05/2023]
Abstract
Partial photoionization cross sections sigmaN(Egamma) and photoelectron angular distributions betaN(Egamma) were measured for the final ionic states He+ (N > 4) in the region between the N = 8 and N = 13 thresholds (Egamma > 78.155 eV) using the cold target recoil ion momentum spectroscopy technique (COLTRIMS). Comparison of the experimental data with two independent sets of theoretical predictions reveals disagreement for the branching ratios to the various HeN(+) states. The angular distributions just below the double ionization threshold suggest an excitation process for highly excited N states similar to the Wannier mechanism for double ionization.
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Affiliation(s)
- A Czasch
- Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany.
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26
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Jahnke T, Czasch A, Schöffler MS, Schössler S, Knapp A, Käsz M, Titze J, Wimmer C, Kreidi K, Grisenti RE, Staudte A, Jagutzki O, Hergenhahn U, Schmidt-Böcking H, Dörner R. Experimental observation of interatomic coulombic decay in neon dimers. Phys Rev Lett 2004; 93:163401. [PMID: 15524986 DOI: 10.1103/physrevlett.93.163401] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2004] [Indexed: 05/24/2023]
Abstract
Recently Cederbaum et al. [Phys. Rev. Lett. 79, 4778 (1997)]] predicted a new decay channel of excited atoms and molecules termed interatomic Coulombic decay (ICD). In ICD the deexcitation energy is transferred via virtual photon exchange to a neighboring atom, which releases it by electron emission. We report on an experimental observation of ICD in 2s ionized neon dimers. The process is unambiguously identified by detecting the energy of two Ne1+ fragments and the ICD electron in coincidence, yielding a clean, background free experimental spectral distribution of the ICD electrons.
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Affiliation(s)
- T Jahnke
- Institut für Kernphysik, J. W. Goethe-Universität Frankfurt am Main, Germany
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27
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Schmidt-Böcking H, Schmidt L, Weber T, Mergel V, Jagutzki O, Czasch A, Hagmann S, Doerner R, Demkov Y, Jahnke T, Prior M, Cocke C, Osipov T, Landers A. Dynamics of multiple ionization of atoms and molecules by electron, photon, and ion impact—investigated by the COLTRIMS imaging method. Radiat Phys Chem Oxf Engl 1993 2004. [DOI: 10.1016/j.radphyschem.2004.04.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Weber T, Czasch AO, Jagutzki O, Müller AK, Mergel V, Kheifets A, Rotenberg E, Meigs G, Prior MH, Daveau S, Landers A, Cocke CL, Osipov T, Díez Muiño R, Schmidt-Böcking H, Dörner R. Complete photo-fragmentation of the deuterium molecule. Nature 2004; 431:437-40. [PMID: 15386008 DOI: 10.1038/nature02839] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2004] [Accepted: 07/13/2004] [Indexed: 11/09/2022]
Abstract
All properties of molecules--from binding and excitation energies to their geometry--are determined by the highly correlated initial-state wavefunction of the electrons and nuclei. Details of these correlations can be revealed by studying the break-up of these systems into their constituents. The fragmentation might be initiated by the absorption of a single photon, by collision with a charged particle or by exposure to a strong laser pulse: if the interaction causing the excitation is sufficiently understood, the fragmentation process can then be used as a tool to investigate the bound initial state. The interaction and resulting fragment motions therefore pose formidable challenges to quantum theory. Here we report the coincident measurement of the momenta of both nuclei and both electrons from the single-photon-induced fragmentation of the deuterium molecule. The results reveal that the correlated motion of the electrons is strongly dependent on the inter-nuclear separation in the molecular ground state at the instant of photon absorption.
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Affiliation(s)
- T Weber
- Institut für Kernphysik, Universität Frankfurt, D 60486 Frankfurt, Germany
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29
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Jahnke T, Foucar L, Titze J, Wallauer R, Osipov T, Benis EP, Alnaser A, Jagutzki O, Arnold W, Semenov SK, Cherepkov NA, Schmidt LPH, Czasch A, Staudte A, Schöffler M, Cocke CL, Prior MH, Schmidt-Böcking H, Dörner R. Vibrationally resolved K-shell photoionization of CO with circularly polarized light. Phys Rev Lett 2004; 93:083002. [PMID: 15447180 DOI: 10.1103/physrevlett.93.083002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2004] [Indexed: 05/24/2023]
Abstract
Diffraction of a low energy (<4 eV) carbon-K-photoelectron wave that is created inside a CO molecule by absorption of a circularly polarized photon is investigated. The measurements resolve the vibrational states of the K-shell ionized CO+ molecule and display the photoelectron diffraction patterns in the molecular frame. These show significant variation for the different vibrational states. This effect is stronger than predicted by state-of-the-art theory. As this study is performed close to C-K-threshold and, therefore, far below the molecule's sigma-shape resonance, this surprisingly strong effect is not related to that resonance phenomenon.
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Affiliation(s)
- T Jahnke
- Institut für Kernphysik, University of Frankfurt, August-Euler Strasse 6, D-60486 Frankfurt, Germany.
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30
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Weber T, Czasch A, Jagutzki O, Müller A, Mergel V, Kheifets A, Feagin J, Rotenberg E, Meigs G, Prior MH, Daveau S, Landers AL, Cocke CL, Osipov T, Schmidt-Böcking H, Dörner R. Fully differential cross sections for photo-double-ionization of D2. Phys Rev Lett 2004; 92:163001. [PMID: 15169223 DOI: 10.1103/physrevlett.92.163001] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2003] [Indexed: 05/24/2023]
Abstract
We report the first kinematically complete study of the four-body fragmentation of the D2 molecule following absorption of a single photon. For equal energy sharing of the two electrons and a photon energy of 75.5 eV, we observed the relaxation of one of the selection rules valid for He photo-double-ionization and a strong dependence of the electron angular distribution on the orientation of the molecular axis. This effect is reproduced by a model in which a pair of photoionization amplitudes is introduced for the light polarization parallel and perpendicular to the molecular axis.
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Affiliation(s)
- Th Weber
- Institut für Kernphysik, Universität Frankfurt, D 60486 Frankfurt, Germany
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31
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Osipov T, Cocke CL, Prior MH, Landers A, Weber T, Jagutzki O, Schmidt L, Schmidt-Böcking H, Dörner R. Photoelectron-photoion momentum spectroscopy as a clock for chemical rearrangements: isomerization of the di-cation of acetylene to the vinylidene configuration. Phys Rev Lett 2003; 90:233002. [PMID: 12857254 DOI: 10.1103/physrevlett.90.233002] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2002] [Indexed: 05/24/2023]
Abstract
We have used complete correlated momentum mapping of the photoelectron and heavy ion products from the dissociation of the di-cation of acetylene, induced by photoionizing the carbon K shell of one of the atoms, to map out the angular correlation between the electron and the axis of the target molecule. The (quasi-) symmetric decay is found to proceed through both acetylene and vinylidene configurations. By using the strongly peaked photoelectron emission to "start a clock," an upper limit of 60 fs is placed on the isomerization time from the acetylene to the vinylidene configuration.
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Affiliation(s)
- T Osipov
- J. R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506, USA
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32
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Weber T, Weckenbrock M, Balser M, Schmidt L, Jagutzki O, Arnold W, Hohn O, Schöffler M, Arenholz E, Young T, Osipov T, Foucar L, De Fanis A, Díez Muiño R, Schmidt-Böcking H, Cocke CL, Prior MH, Dörner R. Auger electron emission from fixed-in-space CO. Phys Rev Lett 2003; 90:153003. [PMID: 12732032 DOI: 10.1103/physrevlett.90.153003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2002] [Indexed: 05/24/2023]
Abstract
We have measured the angular distribution of carbon K-Auger electrons from fixed in space, core-ionized, CO molecules in coincidence with the kinetic energy release of the C+ and O+ fragments. We find a very narrow ejection of Auger electrons in the direction of the oxygen and an oscillatory diffraction pattern. Even for similar electron energies, the angular distribution strongly depends on the symmetry of the final state.
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Affiliation(s)
- Th Weber
- Institut für Kernphysik, University Frankfurt, August-Euler Strasse 6, D-60486 Frankfurt Germany
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33
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Schmidt HT, Fardi A, Schuch R, Schwartz SH, Zettergren H, Cederquist H, Bagge L, Danared H, Källberg A, Jensen J, Rensfelt KG, Mergel V, Schmidt L, Schmidt-Böcking H, Cocke CL. Double-to-single target ionization ratio for electron capture in fast p-He collisions. Phys Rev Lett 2002; 89:163201. [PMID: 12398718 DOI: 10.1103/physrevlett.89.163201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2001] [Indexed: 05/24/2023]
Abstract
We have used the ion storage ring CRYRING and its internal gas-jet target and recoil-ion-momentum spectrometer to measure absolute cross sections for transfer ionization (TI: p+He-->H0+He2++e(-)) in 2.5-4.5 MeV p-He collisions with separate Thomas (TTI) and kinematic (KTI) TI contributions. The probability for electron emission in kinematical capture decreases with increasing velocity and appears to approach the photoionization shakeoff value (1.63%) [T. Aberg, Phys. Rev. A 2, 1726 (1970)]]. The velocity dependence of the TTI cross section is consistent with the theoretically predicted v(-11) scaling [J. S. Briggs and K. Taulbjerg, J. Phys. B 12, 2565 (1979)]].
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Affiliation(s)
- H T Schmidt
- Department of Physics, Stockholm University, Sweden
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34
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Knapp A, Kheifets A, Bray I, Weber T, Landers AL, Schössler S, Jahnke T, Nickles J, Kammer S, Jagutzki O, Schmidt LPH, Osipov T, Rösch J, Prior MH, Schmidt-Böcking H, Cocke CL, Dörner R. Mechanisms of photo double ionization of helium by 530 eV photons. Phys Rev Lett 2002; 89:033004. [PMID: 12144390 DOI: 10.1103/physrevlett.89.033004] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2001] [Indexed: 05/23/2023]
Abstract
We have measured fully differential cross sections for photo double ionization of helium 450 eV above the threshold. We have found an extremely asymmetric energy sharing between the photoelectrons and an angular asymmetry parameter beta approximately 2 and beta approximately 0 for the fast and slow electrons, respectively. The electron angular distributions show a dominance of the shakeoff for 2 eV electrons and clear evidence of an inelastic electron-electron scattering at an electron energy of 30 eV. The data are in excellent agreement with convergent close-coupling calculations.
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Affiliation(s)
- A Knapp
- Institut für Kernphysik, Universität Frankfurt, August-Euler-Strasse 6, D-60486 Frankfurt, Germany
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35
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Muramatsu Y, Ueda K, Saito N, Chiba H, Lavollée M, Czasch A, Weber T, Jagutzki O, Schmidt-Böcking H, Moshammer R, Becker U, Kubozuka K, Koyano I. Direct probe of the bent and linear geometries of the core-excited Renner-Teller pair states by means of the triple-ion-coincidence momentum imaging technique. Phys Rev Lett 2002; 88:133002. [PMID: 11955093 DOI: 10.1103/physrevlett.88.133002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2001] [Indexed: 05/23/2023]
Abstract
The doubly degenerate core-excited Pi state of CO2 splits into two due to static Renner-Teller effect. Using the triple-ion-coincidence momentum imaging technique and focusing on the dependence of the measured quantities on the polarization of the incident light, we have probed, directly and separately, the linear and bent geometries for the B1 and A1 Renner-Teller pair states, as a direct proof of the static Renner-Teller effect.
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Affiliation(s)
- Y Muramatsu
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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36
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Jahnke T, Weber T, Landers AL, Knapp A, Schössler S, Nickles J, Kammer S, Jagutzki O, Schmidt L, Czasch A, Osipov T, Arenholz E, Young AT, Díez Muiño R, Rolles D, García de Abajo FJ, Fadley CS, Van Hove MA, Semenov SK, Cherepkov NA, Rösch J, Prior MH, Schmidt-Böcking H, Cocke CL, Dörner R. Circular dichroism in K-shell ionization from fixed-in-space CO and N2 molecules. Phys Rev Lett 2002; 88:073002. [PMID: 11863892 DOI: 10.1103/physrevlett.88.073002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2001] [Indexed: 05/23/2023]
Abstract
We have measured the angular distributions of 1s photoelectrons excited by circularly and linearly polarized light from fixed-in-space CO and N2 molecules, in the vicinity of their shape resonances. A strong circular dichroism, i.e., a strong dependence on the sense of rotation of the polarization vector of the photons, is found for both molecules. State-of-the-art one-electron multiple scattering and partially correlated random phase approximation calculations are in good agreement with many, but not all, aspects of the experimental data.
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Affiliation(s)
- T Jahnke
- Institut für Kernphysik, University Frankfurt, August-Euler Strasse 6, D-60486 Frankfurt, Germany
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37
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Landers A, Weber T, Ali I, Cassimi A, Hattass M, Jagutzki O, Nauert A, Osipov T, Staudte A, Prior MH, Schmidt-Böcking H, Cocke CL, Dörner R. Photoelectron diffraction mapping: molecules illuminated from within. Phys Rev Lett 2001; 87:013002. [PMID: 11461463 DOI: 10.1103/physrevlett.87.013002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2001] [Indexed: 05/23/2023]
Abstract
We demonstrate the use of a multiparticle coincidence technique to image the diffraction of an electron wave whose source is placed at a specific site in a free molecule. Core-level photoelectrons are used to illuminate the molecule from within. By measuring the vector momenta of two molecular fragments and the photoelectron, a richly structured electron diffraction pattern is obtained in a body-fixed frame of the randomly oriented molecule in the gas phase. We illustrate this technique for CO, creating a photoelectron from the C(1s) shell and scanning its energy from zero to 30 eV.
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Affiliation(s)
- A Landers
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA.
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38
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Mergel V, Dörner R, Khayyat K, Achler M, Weber T, Jagutzki O, Lüdde HJ, Cocke CL, Schmidt-Böcking H. Strong correlations in the He ground state momentum wave function observed in the fully differential momentum distributions for the p + He transfer ionization process. Phys Rev Lett 2001; 86:2257-2260. [PMID: 11289903 DOI: 10.1103/physrevlett.86.2257] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2000] [Indexed: 05/23/2023]
Abstract
The four-particle process of proton-helium transfer ionization has been studied using cold target recoil ion momentum spectroscopy to measure the momenta of all three particles in the final state. Most of the electrons are emitted in the H0 scattering plane and in the backward direction. The final state momentum distributions show discrete structures very different from those expected for uncorrelated capture and ionization. The measured momentum pattern is interpreted to be due to a new transfer ionization reaction channel which results from strong correlations in the initial He ground state momentum wave function.
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Affiliation(s)
- V Mergel
- Institut für Kernphysik der Universität Frankfurt, Germany.
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39
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Weber T, Khayyat K, Dörner R, Rodríguez VD, Mergel V, Jagutzki O, Schmidt L, Müller KA, Afaneh F, Gonzalez A, Schmidt-Böcking H. Abrupt rise of the longitudinal recoil ion momentum distribution for ionizing collisions. Phys Rev Lett 2001; 86:224-227. [PMID: 11177797 DOI: 10.1103/physrevlett.86.224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2000] [Indexed: 05/23/2023]
Abstract
We report on the experimental observation of an abrupt rise in the longitudinal momentum distribution of recoil ions created in proton helium collision. The details of this structure can be related to electrons traveling with the velocity of the projectile [electron capture to the continuum (ECC)]. The longitudinal as well as the transverse distribution of the recoil ions can be explained as a continuation of the momentum distribution from ions resulting from electron capture illustrating the smooth transition from the capture to bound states of the projectile to the ECC.
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Affiliation(s)
- T Weber
- Institut für Kernphysik, Frankfurt-am Main, Germany
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40
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Schmidt-Böcking H, Mergel V, Dörner R, Bräuning H, Achler M, Spielberger L, Jagutzki O, Weber T, Khayyat K, Ullrich J, Cocke CL, Prior MH, Azuma Y, Awaya Y, Kambara T. Cold Target Helium Recoil Ion Momentum Imaging: Understanding Correlated Electron Motion in the Double Ionisation Process. ACTA ACUST UNITED AC 1999. [DOI: 10.1071/ph99020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Novel imaging techniques enable a highly efficient detection of ions and
electrons from ionising multi-fragmentation processes of atoms and molecules
induced by photons and charged particles. From position and time-of-flight
measurements the vector momenta of these fragments are determined. These
devices combine 4Π solid angle with high resolution in momentum space.
They deliver multi-dimensional images of the multi-particle break-up
processes. These fully differential cross sections unveil the physical
processes dominating the reaction. We discuss double ionisation of He induced
by photons and fast protons, which is one of the most fundamental two-electron
systems. New results are presented. In a speculative manner the future
perspectives with respect to the investigation of dynamical electron–
electron correlation are discussed.
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41
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Dörner R, Khemliche H, Prior MH, Cocke CL, Gary JA, Olson RE, Mergel V, Ullrich J, Schmidt-Böcking H. Imaging of Saddle Point Electron Emission in Slow p-He Collisions. Phys Rev Lett 1996; 77:4520-4523. [PMID: 10062559 DOI: 10.1103/physrevlett.77.4520] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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42
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Moshammer R, Ullrich J, Kollmus H, Schmitt W, Unverzagt M, Jagutzki O, Mergel V, Schmidt-Böcking H, Mann R, Woods CJ, Olson RE. Double Ionization of Helium and Neon for Fast Heavy-Ion Impact: Correlated Motion of Electrons from Bound to Continuum States. Phys Rev Lett 1996; 77:1242-1245. [PMID: 10063027 DOI: 10.1103/physrevlett.77.1242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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43
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Dörner R, Feagin JM, Cocke CL, Bräuning H, Jagutzki O, Jung M, Kanter EP, Khemliche H, Kravis S, Mergel V, Prior MH, Schmidt-Böcking H, Spielberger L, Ullrich J, Unversagt M, Vogt T. Fully Differential Cross Sections for Double Photoionization of He Measured by Recoil Ion Momentum Spectroscopy. Phys Rev Lett 1996; 77:1024-1027. [PMID: 10062971 DOI: 10.1103/physrevlett.77.1024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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44
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Spielberger L, Jagutzki O, Krässig B, Meyer U, Khayyat K, Mergel V, Tschentscher T, Buslaps T, Bräuning H, Dörner R, Vogt T, Achler M, Ullrich J, Gemmell DS, Schmidt-Böcking H. Double and single ionization of helium by 58-keV x rays. Phys Rev Lett 1996; 76:4685-4688. [PMID: 10061355 DOI: 10.1103/physrevlett.76.4685] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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45
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Dörner R, Vogt T, Mergel V, Khemliche H, Kravis S, Cocke CL, Ullrich J, Unverzagt M, Spielberger L, Damrau M, Jagutzki O, Ali I, Weaver B, Ullmann K, Hsu CC, Jung M, Kanter EP, Sonntag B, Prior MH, Rotenberg E, Denlinger J, Warwick T, Manson ST, Schmidt-Böcking H. Ratio of cross sections for double to single ionization of He by 85-400 eV photons. Phys Rev Lett 1996; 76:2654-2657. [PMID: 10060755 DOI: 10.1103/physrevlett.76.2654] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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46
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Unverzagt M, Moshammer R, Schmitt W, Olson RE, Jardin P, Mergel V, Ullrich J, Schmidt-Böcking H. Collective behavior of electrons emitted in multiply ionizing collisions of 5.9 MeV/u U65+ with Ne. Phys Rev Lett 1996; 76:1043-1046. [PMID: 10061619 DOI: 10.1103/physrevlett.76.1043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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47
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Spielberger L, Jagutzki O, Dörner R, Ullrich J, Meyer U, Mergel V, Unverzagt M, Damrau M, Vogt T, Ali I, Khayyat K, Bahr D, Schmidt HG, Frahm R, Schmidt-Böcking H. Separation of photoabsorption and Compton scattering contributions to He single and double ionization. Phys Rev Lett 1995; 74:4615-4618. [PMID: 10058555 DOI: 10.1103/physrevlett.74.4615] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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48
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Mergel V, Dörner R, Ullrich J, Jagutzki O, Lencinas S, Nüttgens S, Spielberger L, Unverzagt M, Cocke CL, Olson RE, Schulz M, Buck U, Zanger E, Theisinger W, Isser M, Geis S, Schmidt-Böcking H. State selective scattering angle dependent capture cross sections measured by cold target recoil ion momentum spectroscopy. Phys Rev Lett 1995; 74:2200-2203. [PMID: 10057868 DOI: 10.1103/physrevlett.74.2200] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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49
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Moshammer R, Ullrich J, Unverzagt M, Schmidt W, Jardin P, Olson RE, Mann R, Dörner R, Mergel V, Buck U, Schmidt-Böcking H. Low-Energy Electrons and Their Dynamical Correlation with Recoil Ions for Single Ionization of Helium by Fast, Heavy-Ion Impact. Phys Rev Lett 1994; 73:3371-3374. [PMID: 10057364 DOI: 10.1103/physrevlett.73.3371] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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50
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Bross SW, Bonham SM, Gaus AD, Peacher JL, Vajnai T, Schulz M, Schmidt-Böcking H. Differential transfer ionization cross sections for 50-175-keV proton-helium collisions. Phys Rev A 1994; 50:337-342. [PMID: 9910898 DOI: 10.1103/physreva.50.337] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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