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Hechtfischer U, Levin J, Lange M, Knoll L, Schwalm D, Wester R, Wolf A, Zajfman D. Near-threshold photodissociation of cool OH + to O + H + and O + + H. J Chem Phys 2019; 151:044303. [DOI: 10.1063/1.5098321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- U. Hechtfischer
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - J. Levin
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - M. Lange
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - L. Knoll
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - D. Schwalm
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - R. Wester
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - A. Wolf
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
| | - D. Zajfman
- Weizmann Institute of Science, Rehovot 76100, Israel
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2
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Saha K, Chandrasekaran V, Heber O, Iron MA, Rappaport ML, Zajfman D. Ultraslow isomerization in photoexcited gas-phase carbon cluster [Formula: see text]. Nat Commun 2018; 9:912. [PMID: 29500438 PMCID: PMC5834543 DOI: 10.1038/s41467-018-03197-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 01/26/2018] [Indexed: 01/29/2023] Open
Abstract
Isomerization and carbon chemistry in the gas phase are key processes in many scientific studies. Here we report on the isomerization process from linear [Formula: see text] to its monocyclic isomer. [Formula: see text] ions were trapped in an electrostatic ion beam trap and then excited with a laser pulse of precise energy. The neutral products formed upon photoexcitation were measured as a function of time after the laser pulse. It was found using a statistical model that, although the system is excited above its isomerization barrier energy, the actual isomerization from linear to monocyclic conformation takes place on a very long time scale of up to hundreds of microseconds. This finding may indicate a general phenomenon that can affect the interstellar medium chemistry of large molecule formation as well as other gas phase processes.
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Affiliation(s)
- K. Saha
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, 7610001 Israel
| | - V. Chandrasekaran
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, 7610001 Israel
- Present Address: Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore, 632014 India
| | - O. Heber
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, 7610001 Israel
| | - M. A. Iron
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, 7610001 Israel
| | - M. L. Rappaport
- Department of Physics Core Facilities, Weizmann Institute of Science, Rehovot, 7610001 Israel
| | - D. Zajfman
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, 7610001 Israel
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3
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Gangwar RK, Saha K, Heber O, Rappaport ML, Zajfman D. Autoresonance Cooling of Ions in an Electrostatic Ion Beam Trap. Phys Rev Lett 2017; 119:103202. [PMID: 28949158 DOI: 10.1103/physrevlett.119.103202] [Citation(s) in RCA: 6] [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: 11/13/2016] [Indexed: 06/07/2023]
Abstract
Autoresonance (AR) cooling of a bunch of ions oscillating inside an electrostatic ion beam trap is demonstrated for the first time. The relatively wide initial longitudinal velocity distribution is reduced by at least an order of magnitude using AR acceleration and ramping forces. The hot ions escaping the bunch are not lost from the system but continue to oscillate in the trap outside of the bunch and may be further cooled by successive AR processes. Ion-ion collisions inside the bunch close to the turning points in the trap's mirrors contribute to the thermalization of the ions. This cooling method can be applied to any mass and any charge.
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Affiliation(s)
- R K Gangwar
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - K Saha
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - O Heber
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - M L Rappaport
- Physics Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - D Zajfman
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
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4
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Saha K, Prabhakaran A, Chandrasekaran V, Rappaport ML, Heber O, Zajfman D. An experimental setup to study delayed electron emission upon photoexcitation of trapped polyatomic anions. Rev Sci Instrum 2017; 88:053101. [PMID: 28571459 DOI: 10.1063/1.4982034] [Citation(s) in RCA: 4] [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] [Indexed: 06/07/2023]
Abstract
A Velocity Map Imaging (VMI) spectrometer has been designed and integrated with an electrostatic ion beam trap to study delayed electron emission from trapped polyatomic anions upon photodetachment. The VMI spectrometer is small in size and can record a wide range of photoelectron energies, with variable magnification. Delayed electron emission can be recorded in our experimental setup for any time duration after the photoexcitation of the polyatomic anions. Experiments were carried out with trapped O- and C5- ions to demonstrate the capability of the spectrometer. Delayed electron emissions from C5- as well as prompt photoelectrons from O- were detected by the VMI spectrometer upon photoexcitation. The design and performance of the spectrometer are presented in detail.
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Affiliation(s)
- K Saha
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel
| | - A Prabhakaran
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel
| | - V Chandrasekaran
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel
| | - M L Rappaport
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel
| | - O Heber
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel
| | - D Zajfman
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel
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5
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Saha K, Gangwar RK, Heber O, Rappaport ML, Zajfman D. Observation of longitudinal quadrupole ion bunch oscillations in an electrostatic ion beam trap. Rev Sci Instrum 2016; 87:113302. [PMID: 27910333 DOI: 10.1063/1.4966914] [Citation(s) in RCA: 5] [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: 08/12/2016] [Accepted: 10/20/2016] [Indexed: 06/06/2023]
Abstract
Ions in an ion bunch trapped inside an Electrostatic Ion Beam Trap (EIBT) exhibit collective oscillations within the bunch under the influence of an external driving force. These internal oscillations have been measured explicitly using a new method with a particle detector outside the EIBT. In this approach, the evolving ion bunch is monitored along the entire trap length, in contrast to the localized single point measurements that are often carried out in other techniques. In the present study, quadrupole oscillations have been measured for the first time in an EIBT along with the dipole oscillations that were measured previously. The frequency of the quadrupole oscillation is found to be about twice the dipole oscillation frequency. This is in agreement with the prediction of a theoretical model.
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Affiliation(s)
- K Saha
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - R K Gangwar
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - O Heber
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - M L Rappaport
- Physics Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - D Zajfman
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel
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6
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von Hahn R, Becker A, Berg F, Blaum K, Breitenfeldt C, Fadil H, Fellenberger F, Froese M, George S, Göck J, Grieser M, Grussie F, Guerin EA, Heber O, Herwig P, Karthein J, Krantz C, Kreckel H, Lange M, Laux F, Lohmann S, Menk S, Meyer C, Mishra PM, Novotný O, O'Connor AP, Orlov DA, Rappaport ML, Repnow R, Saurabh S, Schippers S, Schröter CD, Schwalm D, Schweikhard L, Sieber T, Shornikov A, Spruck K, Sunil Kumar S, Ullrich J, Urbain X, Vogel S, Wilhelm P, Wolf A, Zajfman D. The cryogenic storage ring CSR. Rev Sci Instrum 2016; 87:063115. [PMID: 27370434 DOI: 10.1063/1.4953888] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed, and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 ± 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion), and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm(-3) is derived, equivalent to a room-temperature pressure below 10(-14) mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams.
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Affiliation(s)
- R von Hahn
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - A Becker
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - F Berg
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - C Breitenfeldt
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - H Fadil
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - F Fellenberger
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - M Froese
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S George
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - J Göck
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - M Grieser
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - F Grussie
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - E A Guerin
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - O Heber
- Weizmann Institute of Science, Rehovot 76100, Israel
| | - P Herwig
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - J Karthein
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - C Krantz
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - H Kreckel
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - M Lange
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - F Laux
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Lohmann
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Menk
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - C Meyer
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - P M Mishra
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - O Novotný
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - A P O'Connor
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D A Orlov
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - M L Rappaport
- Weizmann Institute of Science, Rehovot 76100, Israel
| | - R Repnow
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Saurabh
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Schippers
- I. Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - C D Schröter
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D Schwalm
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - L Schweikhard
- Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany
| | - T Sieber
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - A Shornikov
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - K Spruck
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Sunil Kumar
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - J Ullrich
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - X Urbain
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - S Vogel
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - P Wilhelm
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - A Wolf
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D Zajfman
- Weizmann Institute of Science, Rehovot 76100, Israel
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7
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Aviv O, Kafle B, Chandrasekaran V, Heber O, Rappaport ML, Rubinstein H, Schwalm D, Strasser D, Toker Y, Zajfman D. Absolute photo-destruction and photo-fragmentation cross section measurements using an electrostatic ion beam trap. Rev Sci Instrum 2013; 84:053106. [PMID: 23742531 DOI: 10.1063/1.4804646] [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] [Indexed: 06/02/2023]
Abstract
We describe a technique to measure absolute photo-induced cross sections for cluster anions stored in an electrostatic ion beam trap (EIBT) with a central deflector. The setup allows determination of total photo-destruction cross sections as well as partial cross sections for fragmentation and electron detachment. The unique properties of this special EIBT setup are investigated and illustrated using small Al(n)(-) clusters.
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Affiliation(s)
- O Aviv
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel
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8
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Jordon-Thaden B, Kreckel H, Golser R, Schwalm D, Berg MH, Buhr H, Gnaser H, Grieser M, Heber O, Lange M, Novotný O, Novotny S, Pedersen HB, Petrignani A, Repnow R, Rubinstein H, Shafir D, Wolf A, Zajfman D. Structure and stability of the negative hydrogen molecular ion. Phys Rev Lett 2011; 107:193003. [PMID: 22181602 DOI: 10.1103/physrevlett.107.193003] [Citation(s) in RCA: 5] [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: 08/17/2011] [Indexed: 05/31/2023]
Abstract
We present the results of a Coulomb explosion experiment that allows for the imaging of the rovibrational wave function of the metastable H2- ion. Our measurements confirm the predicted large internuclear separation of 6 a.u., and they show that the ion decays by autodetachment rather than by spontaneous dissociation. Imaging of the resulting H2 products reveals a large angular momentum of J = 25 ± 2, quantifying the rotation that leads to the metastability of this most fundamental molecular anion.
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Affiliation(s)
- B Jordon-Thaden
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
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9
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Buhr H, Stützel J, Mendes MB, Novotný O, Schwalm D, Berg MH, Bing D, Grieser M, Heber O, Krantz C, Menk S, Novotny S, Orlov DA, Petrignani A, Rappaport ML, Repnow R, Zajfman D, Wolf A. Hot water molecules from dissociative recombination of D3O+ with cold electrons. Phys Rev Lett 2010; 105:103202. [PMID: 20867518 DOI: 10.1103/physrevlett.105.103202] [Citation(s) in RCA: 7] [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: 04/27/2010] [Indexed: 05/29/2023]
Abstract
Individual product channels in the dissociative recombination of deuterated hydronium ions and cold electrons are studied in an ion storage ring by velocity imaging using spatial and mass-sensitive detection of the neutral reaction fragments. Initial and final molecular excitation are analyzed, finding the outgoing water molecules to carry internal excitation of more than 3 eV in 90% of the recombination events. Initial rotation is found to be substantial and in three-body breakup strongly asymmetric energy repartition among the deuterium products is enhanced for hot parent ions.
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Affiliation(s)
- H Buhr
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany.
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10
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Lange M, Froese M, Menk S, Varju J, Bastert R, Blaum K, López-Urrutia JRC, Fellenberger F, Grieser M, von Hahn R, Heber O, Kühnel KU, Laux F, Orlov DA, Rappaport ML, Repnow R, Schröter CD, Schwalm D, Shornikov A, Sieber T, Toker Y, Ullrich J, Wolf A, Zajfman D. A cryogenic electrostatic trap for long-time storage of keV ion beams. Rev Sci Instrum 2010; 81:055105. [PMID: 20515170 DOI: 10.1063/1.3372557] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report on the realization and operation of a fast ion beam trap of the linear electrostatic type employing liquid helium cooling to reach extremely low blackbody radiation temperature and residual gas density and, hence, long storage times of more than 5 min which are unprecedented for keV ion beams. Inside a beam pipe that can be cooled to temperatures <15 K, with 1.8 K reached in some locations, an ion beam pulse can be stored at kinetic energies of 2-20 keV between two electrostatic mirrors. Along with an overview of the cryogenic trap design, we present a measurement of the residual gas density inside the trap resulting in only 2 x 10(3) cm(-3), which for a room temperature environment corresponds to a pressure in the 10(-14) mbar range. The device, called the cryogenic trap for fast ion beams, is now being used to investigate molecules and clusters at low temperatures, but has also served as a design prototype for the cryogenic heavy-ion storage ring currently under construction at the Max-Planck Institute for Nuclear Physics.
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Affiliation(s)
- M Lange
- Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany.
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11
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Shafir D, Novotny S, Buhr H, Altevogt S, Faure A, Grieser M, Harvey AG, Heber O, Hoffmann J, Kreckel H, Lammich L, Nevo I, Pedersen HB, Rubinstein H, Schneider IF, Schwalm D, Tennyson J, Wolf A, Zajfman D. Rotational cooling of HD+ molecular ions by superelastic collisions with electrons. Phys Rev Lett 2009; 102:223202. [PMID: 19658863 DOI: 10.1103/physrevlett.102.223202] [Citation(s) in RCA: 3] [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: 02/27/2009] [Indexed: 05/28/2023]
Abstract
Merging an HD+ beam with velocity matched electrons in a heavy ion storage ring we observed rapid cooling of the rotational excitations of the HD+ ions by superelastic collisions (SEC) with the electrons. The cooling process is well described using theoretical SEC rate coefficients obtained by combining the molecular R-matrix approach with the adiabatic nuclei rotation approximation. We verify the DeltaJ=-2 SEC rate coefficients, which are predicted to be dominant as opposed to the DeltaJ=-1 rates and to amount to (1-2)x10;{-6} cm;{3} s;{-1} for initial angular momentum states with J< or =7, to within 30%.
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Affiliation(s)
- D Shafir
- Department of Particle Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
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12
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Aviv O, Toker Y, Errit M, Bhushan KG, Pedersen HB, Rappaport ML, Heber O, Schwalm D, Zajfman D. A bent electrostatic ion beam trap for simultaneous measurements of fragmentation and ionization of cluster ions. Rev Sci Instrum 2008; 79:083110. [PMID: 19044339 DOI: 10.1063/1.2972151] [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] [Indexed: 05/27/2023]
Abstract
We describe a bent electrostatic ion beam trap in which cluster ions of several keV kinetic energy can be stored on a V-shaped trajectory by means of an electrostatic deflector placed between two electrostatic mirrors. While maintaining all the advantages of its linear counterpart [Zajfman et al., Phys. Rev. A 55, R1577 (1997); Dahan et al., Rev. Sci. Instrum. 69, 76 (1998)], such as long storage times, straight segments, and a field-free region for merged or crossed beam experiments, the bent trap allows for simultaneous measurement of charged and neutral fragments and determination of the average kinetic energy released in the fragmentation. These unique properties of the bent trap are illustrated by first results concerning the competition between delayed fragmentation and ionization of Al(n) (-) clusters after irradiation by a short laser pulse.
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Affiliation(s)
- O Aviv
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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13
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Novotny S, Rubinstein H, Buhr H, Novotný O, Hoffmann J, Mendes MB, Orlov DA, Krantz C, Berg MH, Froese M, Jaroshevich AS, Jordon-Thaden B, Lange M, Lestinsky M, Petrignani A, Shafir D, Zajfman D, Schwalm D, Wolf A. Anisotropy and molecular rotation in resonant low-energy dissociative recombination. Phys Rev Lett 2008; 100:193201. [PMID: 18518450 DOI: 10.1103/physrevlett.100.193201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2007] [Indexed: 05/26/2023]
Abstract
Angular fragment distributions from the dissociative recombination (DR) of HD(+) were measured with well directed monochromatic low-energy electrons over a dense grid of collision energies from 7 to 35 meV, where pronounced rovibrational Feshbach resonances occur. Significant higher-order anisotropies are found in the distributions, whose size varies along energy in a partial correlation with the relative DR rate from fast-rotating molecules. This may indicate a breakdown of the nonrotation assumption so far applied to predict angular DR fragment distributions.
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Affiliation(s)
- S Novotny
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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14
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Hechtfischer U, Rostas J, Lange M, Linkemann J, Schwalm D, Wester R, Wolf A, Zajfman D. Photodissociation spectroscopy of stored CH+ and CD+ ions: Analysis of the b 3Σ−-a 3Π system. J Chem Phys 2007; 127:204304. [DOI: 10.1063/1.2800004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Affiliation(s)
- U. Hechtfischer
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg,
Germany
| | - J. Rostas
- Laboratoire de Photophysique Moléculaire, Université Paris Sud, 91405 Orsay Cedex, France
| | - M. Lange
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg,
Germany
| | - J. Linkemann
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg,
Germany
| | - D. Schwalm
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg,
Germany
| | - R. Wester
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg,
Germany
| | - A. Wolf
- Max-Planck-Institut für Kernphysik, 69029 Heidelberg,
Germany
| | - D. Zajfman
- Weizmann Institute of Science, Rehovot, 76100, Israel
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15
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Pedersen HB, Altevogt S, Jordon-Thaden B, Heber O, Rappaport ML, Schwalm D, Ullrich J, Zajfman D, Treusch R, Guerassimova N, Martins M, Hoeft JT, Wellhöfer M, Wolf A. Crossed beam photodissociation imaging of HeH+ with vacuum ultraviolet free-electron laser pulses. Phys Rev Lett 2007; 98:223202. [PMID: 17677841 DOI: 10.1103/physrevlett.98.223202] [Citation(s) in RCA: 3] [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: 02/21/2007] [Indexed: 05/16/2023]
Abstract
Molecular photofragmentation has been studied by event imaging on HeH+ ions at 32 nm (38.7 eV) in a fast ion beam crossed with the free-electron laser in Hamburg (FLASH), analyzing neutral He product directions and energies. Fragmentation into He(1snl,n > or = 2)+H+ was observed to yield significant photodissociation at 32 nm with an absolute cross section of (1.4+/-0.7) x 10(-18) cm2, releasing energies of 10-20 eV. A clear dominance of photodissociation perpendicular to the laser polarization was found in contrast to the excitation paths so far emphasized in theoretical studies.
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Affiliation(s)
- H B Pedersen
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany.
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16
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Wolf A, Kreckel H, Lammich L, Strasser D, Mikosch J, Glosík J, Plasil R, Altevogt S, Andrianarijaona V, Buhr H, Hoffmann J, Lestinsky M, Nevo I, Novotny S, Orlov DA, Pedersen HB, Terekhov AS, Toker J, Wester R, Gerlich D, Schwalm D, Zajfman D. Effects of molecular rotation in low-energy electron collisions of H3+. Philos Trans A Math Phys Eng Sci 2006; 364:2981-96; discussion 2996-7. [PMID: 17015371 DOI: 10.1098/rsta.2006.1881] [Citation(s) in RCA: 12] [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] [Indexed: 05/12/2023]
Abstract
Measurements on the energetic structure of the dissociative recombination rate coefficient in the millielectronvolt range are described for H3+ ions produced in the lowest rotational levels by collisional cooling and stored as a fast beam in the magnetic storage ring TSR (Test Storage Ring). The observed resonant structure is consistent with that found previously at the storage ring facility CRYRING in Stockholm, Sweden; theoretical predictions yield good agreement on the overall size of the rate coefficient, but do not reproduce the detailed structure. First studies on the nuclear spin symmetry influencing the lowest level populations show a small effect different from the theoretical predictions. Heating processes in the residual gas and by collisions with energetic electrons, as well as cooling owing to interaction with cold electrons, were observed in long-time storage experiments, using the low-energy dissociative recombination rate coefficient as a probe, and their consistency with the recent cold H3+ measurements is discussed.
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Affiliation(s)
- Andreas Wolf
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany.
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Kreckel H, Motsch M, Mikosch J, Glosík J, Plasil R, Altevogt S, Andrianarijaona V, Buhr H, Hoffmann J, Lammich L, Lestinsky M, Nevo I, Novotny S, Orlov DA, Pedersen HB, Sprenger F, Terekhov AS, Toker J, Wester R, Gerlich D, Schwalm D, Wolf A, Zajfman D. High-resolution dissociative recombination of cold H3+and first evidence for nuclear spin effects. Phys Rev Lett 2005; 95:263201. [PMID: 16486349 DOI: 10.1103/physrevlett.95.263201] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2005] [Indexed: 05/06/2023]
Abstract
The energy-resolved rate coefficient for the dissociative recombination (DR) of H(3)(+) with slow electrons has been measured by the storage-ring method using an ion beam produced from a radiofrequency multipole ion trap, employing buffer-gas cooling at 13 K. The electron energy spread of the merged-beams measurement is reduced to 500 microeV by using a cryogenic GaAs photocathode. This and a previous cold- measurement jointly confirm the capability of ion storage rings, with suitable ion sources, to store and investigate H(3)(+) in the two lowest, (J,G) = (1,1) and (1,0) rotational states prevailing also in cold interstellar matter. The use of para-H(2) in the ion source, expected to enhance para-H(3)(+) in the stored ion beam, is found to increase the DR rate coefficient at meV electron energies.
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Affiliation(s)
- H Kreckel
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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Zajfman D, Wolf A, Schwalm D, Orlov DA, Grieser M, Hahn RV, Welsch CP, Lopez-Urrutia JRC, Schröter CD, Urbain X, Ullrich J. Physics with colder molecular ions: The Heidelberg Cryogenic Storage Ring CSR. ACTA ACUST UNITED AC 2005. [DOI: 10.1088/1742-6596/4/1/046] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Kreckel H, Mikosch J, Wester R, Glosík J, Plasil R, Motsch M, Gerlich D, Schwalm D, Zajfman D, Wolf A. Towards state selective measurements of the H3+dissociative recombination rate coefficient. ACTA ACUST UNITED AC 2005. [DOI: 10.1088/1742-6596/4/1/017] [Citation(s) in RCA: 5] [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: 11/12/2022]
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20
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Diner A, Toker Y, Strasser D, Heber O, Ben-Itzhak I, Witte PD, Wolf A, Schwalm D, Rappaport ML, Bhushan KG, Zajfman D. Size-dependent electron-impact detachment of internally cold Cn- and Aln- clusters. Phys Rev Lett 2004; 93:063402. [PMID: 15323629 DOI: 10.1103/physrevlett.93.063402] [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: 01/28/2004] [Indexed: 05/24/2023]
Abstract
The cross sections for electron detachment of internally cold Cn- and Aln- clusters were measured using an electrostatic ion beam trap fitted with an internal electron target. The measured electron-impact detachment cross sections for the Cn- (n = 1-9) clusters exhibit even-odd oscillations reflecting the binding energy trend, namely, higher cross sections for weaker binding. Surprisingly, however, these cross sections increase on the average with cluster size, n, in spite of the increase in electron binding. In contrast, the Aln- (n = 2-5) clusters follow the known scaling laws for electron detachment. We suggest that the size-dependent polarizability of these clusters is responsible for the observed behavior.
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Affiliation(s)
- A Diner
- Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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Lammich L, Strasser D, Kreckel H, Lange M, Pedersen HB, Altevogt S, Andrianarijaona V, Buhr H, Heber O, Witte P, Schwalm D, Wolf A, Zajfman D. Evidence for subthermal rotational populations in stored molecular ions through state-dependent dissociative recombination. Phys Rev Lett 2003; 91:143201. [PMID: 14611521 DOI: 10.1103/physrevlett.91.143201] [Citation(s) in RCA: 9] [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: 04/06/2003] [Indexed: 05/24/2023]
Abstract
We demonstrate that the dissociative recombination of D2H+ with low-energy electrons depends on the rotational energy of the molecular ion such that highly excited ions have a larger rate coefficient than colder ones. Observations on an ion beam continuously interacting with electrons at low relative velocity indicate that excited rotational levels are preferentially depleted which, in competition with radiative heating due to blackbody radiation, provides an opportunity for controlling the rotational temperature of stored molecules.
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Affiliation(s)
- L Lammich
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
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22
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Strasser D, Geyer T, Pedersen HB, Heber O, Goldberg S, Amarant B, Diner A, Rudich Y, Sagi I, Rappaport M, Tannor DJ, Zajfman D. Negative mass instability for interacting particles in a 1D box: theory and application. Phys Rev Lett 2002; 89:283204. [PMID: 12513144 DOI: 10.1103/physrevlett.89.283204] [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: 07/23/2002] [Indexed: 05/24/2023]
Abstract
We demonstrate that the synchronization effect observed [Pedersen et al., Phys. Rev. Lett. 87, 055001 (2001)]], when a bunch of ions oscillates between two mirrors in an electrostatic ion beam trap, can be explained as a negative mass instability. We derive simple necessary conditions for the existence of a regime in which this dispersionless behavior occurs and demonstrate that in this regime, the ion trap can be used as a high resolution mass spectrometer.
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Affiliation(s)
- D Strasser
- Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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23
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Wester R, Hechtfischer U, Knoll L, Lange M, Levin J, Scheffel M, Schwalm D, Wolf A, Baer A, Vager Z, Zajfman D, Mladenović M, Schmatz S. Relaxation dynamics of deuterated formyl and isoformyl cations. J Chem Phys 2002. [DOI: 10.1063/1.1461812] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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24
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Pedersen HB, Strasser D, Ring S, Heber O, Rappaport ML, Rudich Y, Sagi I, Zajfman D. Ion motion synchronization in an ion-trap resonator. Phys Rev Lett 2001; 87:055001. [PMID: 11497779 DOI: 10.1103/physrevlett.87.055001] [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: 12/26/2000] [Indexed: 05/23/2023]
Abstract
Using a new type of ion trap, we demonstrate that the length of a packet of charged particles oscillating between two electrostatic mirrors will remain constant under special conditions. The effect can be understood in terms of phase synchronization, where, in a rather counterintuitive way, the repulsive Coulomb interaction between the ions actually holds the packet together. Application of this effect for mass spectrometry is discussed.
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Affiliation(s)
- H B Pedersen
- Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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25
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Krohn S, Lange M, Grieser M, Knoll L, Kreckel H, Levin J, Repnow R, Schwalm D, Wester R, Witte P, Wolf A, Zajfman D. Rate coefficients and final states for the dissociative recombination of LiH+. Phys Rev Lett 2001; 86:4005-4008. [PMID: 11328081 DOI: 10.1103/physrevlett.86.4005] [Citation(s) in RCA: 6] [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: 12/19/2000] [Indexed: 05/23/2023]
Abstract
The dissociative recombination of LiH+ ions with low-energy electrons is observed at a storage ring and the final states are analyzed using fragment imaging and field ionization techniques. The rate coefficient is found to be larger than its estimated value used in astrophysical models. Mostly the highest energetically possible Rydberg states of the lithium atom are populated by the reaction, indicating a common trend for molecular recombination via the noncrossing mode.
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Affiliation(s)
- S Krohn
- Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel and Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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26
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Strasser D, Lammich L, Krohn S, Lange M, Kreckel H, Levin J, Schwalm D, Vager Z, Wester R, Wolf A, Zajfman D. Two- and three-body kinematical correlation in the dissociative recombination of H(3)(+). Phys Rev Lett 2001; 86:779-782. [PMID: 11177938 DOI: 10.1103/physrevlett.86.779] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2000] [Indexed: 05/23/2023]
Abstract
Fragmentation patterns for dissociative recombination of the triatomic hydrogen molecular ion H(3)(+) in the vibrational ground state have been measured using the storage ring technique and molecular fragment imaging. A broad distribution of vibrational states in the H(2) fragment after two-body dissociation and a large predominance of nearly linear momentum geometries after three-body dissociation are found. The fragmentation results are directly contrasted with Coulomb explosion imaging data on the initial H(3)(+) geometry, compared to existing wave-packet calculations, and considered in the light of a simple physical picture.
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Affiliation(s)
- D Strasser
- Department of Particle Physics, Weizmann Institute of Science, Rehovet, Israel
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27
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Naaman A, Bhushan KG, Pedersen HB, Altstein N, Heber O, Rappaport ML, Moalem R, Zajfman D. Metastable states of negative carbon clusters: Cn−, n=2–6. J Chem Phys 2000. [DOI: 10.1063/1.1286978] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Wester R, Bhushan KG, Altstein N, Zajfman D, Heber O, Rappaport ML. Radiative lifetime measurement of the a 3Σ+ metastable state of NO+ using a new type of electrostatic ion trap. J Chem Phys 1999. [DOI: 10.1063/1.479168] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Amitay Z, Baer A, Dahan M, Knoll L, Lange M, Levin J, Schneider IF, Schwalm D, Suzor-Weiner A, Vager Z, Wester R, Wolf A, Zajfman D. Dissociative recombination of HD+ in selected vibrational quantum states. Science 1998; 281:75-8. [PMID: 9651247 DOI: 10.1126/science.281.5373.75] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [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
Rate coefficients for dissociative recombination of HD+ in selected vibrational states have been measured by a combination of two molecular fragment imaging methods by using the heavy-ion storage ring technique. Recombination fragment imaging yields state-to-state reaction rates. These rates are converted to rate coefficients by using vibrational level populations of the stored ion beam, derived from nuclear coordinate distributions measured on extracted ions. The results show strongly increasing rate coefficients for high vibrational excitation, where additional dissociation routes open up, in agreement with a theoretical calculation. Very low rate coefficients are found for certain, isolated vibrational states.
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Affiliation(s)
- Z Amitay
- Z. Amitay, A. Baer, M. Dahan, J. Levin, Z. Vager, D. Zajfman, Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel. L. Knoll, M. Lange, D. Schwalm, R. Wester, A. Wolf, Max-Planck-Institut fur Kernphysik and
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Andersen LH, Heber O, Kella D, Pedersen HB, Vejby-Christensen L, Zajfman D. Production of Water Molecules from Dissociative Recombination of H3O + with Electrons. Phys Rev Lett 1996; 77:4891-4894. [PMID: 10062661 DOI: 10.1103/physrevlett.77.4891] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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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31
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Semaniak J, Rosén S, Sundström G, Strömholm C, Datz S, Danared H, Larsson M, Amitay Z, Hechtfischer U, Grieser M, Repnow R, Schmidt M, Schwalm D, Wester R, Wolf A, Zajfman D. Product-state distributions in the dissociative recombination of 3HeD+ and 4HeH+. Phys Rev A 1996; 54:R4617-R4620. [PMID: 9914131 DOI: 10.1103/physreva.54.r4617] [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: 05/22/2023]
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32
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Amitay Z, Zajfman D, Forck P, Hechtfischer U, Seidel B, Grieser M, Habs D, Repnow R, Schwalm D, Wolf A. Dissociative recombination of CH+: Cross section and final states. Phys Rev A 1996; 54:4032-4050. [PMID: 9913951 DOI: 10.1103/physreva.54.4032] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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33
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Amitay Z, Zajfman D, Forck P, Heupel T, Grieser M, Habs D, Repnow R, Schwalm D, Wolf A, Guberman SL. Dissociative recombination of cold OH+: Evidence for indirect recombination through excited core Rydberg states. Phys Rev A 1996; 53:R644-R647. [PMID: 9913007 DOI: 10.1103/physreva.53.r644] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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34
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Zajfman D, Amitay Z, Broude C, Forck P, Seidel B, Grieser M, Habs D, Schwalm D, Wolf A. Measurement of branching ratios for the dissociative recombination of cold HD+ using fragment imaging. Phys Rev Lett 1995; 75:814-817. [PMID: 10060125 DOI: 10.1103/physrevlett.75.814] [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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35
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Zajfman D, Amitay Z. Measurement of the vibrational populations of molecular ions and its application to dissociative recombination in storage rings. Phys Rev A 1995; 52:839-842. [PMID: 9912307 DOI: 10.1103/physreva.52.839] [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: 05/22/2023]
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36
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Amitay Z, Zajfman D, Forck P. Rotational and vibrational lifetime of isotopically asymmetrized homonuclear diatomic molecular ions. Phys Rev A 1994; 50:2304-2308. [PMID: 9911145 DOI: 10.1103/physreva.50.2304] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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37
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Forck P, Broude C, Grieser M, Habs D, Kenntner J, Liebmann J, Repnow R, Schwalm D, Wolf A, Amitay Z, Zajfman D. New resonances in the dissociative recombination of vibrationally cold CD+. Phys Rev Lett 1994; 72:2002-2005. [PMID: 10055763 DOI: 10.1103/physrevlett.72.2002] [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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Vager Z, Zajfman D, Graber T, Kanter EP. Experimental evidence for anomalous nuclear delocalization in C2H3+. Phys Rev Lett 1993; 71:4319-4322. [PMID: 10055216 DOI: 10.1103/physrevlett.71.4319] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [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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Forck P, Grieser M, Habs D, Lampert A, Repnow R, Schwalm D, Wolf A, Zajfman D. Dissociative recombination of cold HD+ at the Test Storage Ring. Phys Rev Lett 1993; 70:426-429. [PMID: 10054109 DOI: 10.1103/physrevlett.70.426] [Citation(s) in RCA: 17] [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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42
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Zajfman D, Feldman H, Heber O, Kella D, Majer D, Vager Z, Naaman R. Electron Photodetachment Cross Sections of Small Carbon Clusters: Evidence for Nonlinear Isomers. Science 1992; 258:1129-31. [PMID: 17789083 DOI: 10.1126/science.258.5085.1129] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Absolute cross sections for photodetachment of negative carbon clusters are reported for Cn (n = 3, ..., 8). The results indicate that various neutral isomers exist, some with electron affinities as low as 1 electron volt. The method of production plays an important role in the characteristics of carbon clusters.
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Zajfman D, Graber T, Kanter EP, Vager Z. Influence of multiple scattering on the Coulomb-explosion imaging of fast molecules. Phys Rev A 1992; 46:194-200. [PMID: 9907848 DOI: 10.1103/physreva.46.194] [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: 05/22/2023]
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44
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Zajfman D, Vager Z, Naaman R, Mitchell RE, Kanter EP, Graber T, Belkacem A. The structures of C2H+ and C2H+2 as measured by Coulomb explosion imaging. J Chem Phys 1991. [DOI: 10.1063/1.460316] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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45
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Zajfman D, Belkacem A, Graber T, Kanter EP, Mitchell RE, Naaman R, Vager Z, Zabransky BJ. Measurement of the distribution of bond angles in H2O+. J Chem Phys 1991. [DOI: 10.1063/1.459881] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Zajfman D, Kanter EP, Vager Z, Zajfman J. Sensitivity of Coulomb-explosion images to the shapes of molecular potentials: The case of He22+. Phys Rev A 1991; 43:1608-1610. [PMID: 9905188 DOI: 10.1103/physreva.43.1608] [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: 05/22/2023]
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47
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Zajfman D. Effect of coherent multiple scattering on the transmission of H2+ through thin foils. Phys Rev A 1990; 42:5374-5377. [PMID: 9904670 DOI: 10.1103/physreva.42.5374] [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: 05/22/2023]
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48
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Ben-Itzhak I, Gertner I, Bortman D, Zajfman D. Formation of doubly charged molecular ion Ne22+ in sub-MeV stripping collision Ne2++Ar-->Ne22+. Phys Rev A 1990; 41:6548-6551. [PMID: 9903062 DOI: 10.1103/physreva.41.6548] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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49
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Zajfman D, Both G, Kanter EP, Vager Z. Multiple scattering of MeV atomic and molecular ions traversing ultrathin films. Phys Rev A 1990; 41:2482-2488. [PMID: 9903380 DOI: 10.1103/physreva.41.2482] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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50
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Ben-Itzhak I, Gertner I, Heber O, Maor D, Zajfman D, Rosner B. Correlations between outgoing charge states in Arq+ + He close collisions. Phys Rev A Gen Phys 1989; 39:2899-2904. [PMID: 9901581 DOI: 10.1103/physreva.39.2899] [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: 05/22/2023]
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