1
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Travnikova O, Hosseini F, Marchenko T, Guillemin R, Ismail I, Moussaoui R, Journel L, Milosavljević AR, Bozek JD, Kukk E, Püttner R, Piancastelli MN, Simon M. Dynamics of core-excited ammonia: disentangling fragmentation pathways by complementary spectroscopic methods. Phys Chem Chem Phys 2023; 25:1063-1074. [PMID: 36383083 DOI: 10.1039/d2cp03488c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fragmentation dynamics of core-excited isolated ammonia molecules is studied by two different and complementary experimental methods, high-resolution resonant Auger spectroscopy and electron energy-selected Auger electron-photoion coincidence spectroscopy (AEPICO). The combined use of these two techniques allows obtaining information on different dissociation patterns, in particular fragmentation before relaxation, often called ultrafast dissociation (UFD), and fragmentation after relaxation. The resonant Auger spectra contain the spectral signature of both molecular and fragment final states, and therefore can provide information on all events occurring during the core-hole lifetime, in particular fragmentation before relaxation. Coincidence measurements allow correlating Auger electrons with ionic fragments from the same molecule, and relating the ionic fragments to specific Auger final electronic states, and yield additional information on which final states are dissociative, and which ionic fragments can be produced in timescales either corresponding to the core-hole lifetime or longer. Furthermore, we show that by the combined use of two complementary experimental techniques we are able to identify more electronic states of the NH2+ fragment with respect to the single one already reported in the literature.
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Affiliation(s)
- Oksana Travnikova
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Farzad Hosseini
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.,Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette Cedex, France
| | - Tatiana Marchenko
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Renaud Guillemin
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Iyas Ismail
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Roba Moussaoui
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Loïc Journel
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | | | - John D Bozek
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette Cedex, France
| | - Edwin Kukk
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.,Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Ralph Püttner
- Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Maria Novella Piancastelli
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.,Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden.
| | - Marc Simon
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
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2
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Brumboiu IE, Fransson T. Core-hole delocalization for modeling X-ray spectroscopies: A cautionary tale. J Chem Phys 2022; 156:214109. [DOI: 10.1063/5.0088195] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The influence of core-hole delocalization for X-ray photoelectron, X-ray absorption, and X-ray emission spectrum calculations is investigated in detail, using approaches including response theory, transition-potential methods, and ground state schemes. The question of a localized/delocalized vacancy is relevant for systems with symmetrically equivalent atoms, as well as near-degeneracies which can distribute the core-orbitals over several atoms. We show that issues relating to core-hole delocalization are present for calculations considering explicit core-hole states, e.g. when using a core-excited or core-ionized reference state, or for fractional occupation numbers. Including electron correlation eventually alleviates the issues, but even using CCSD(T) there is a noticable discrepancy between core-ionization energies obtained with a localized and delocalized core-hole (0.5 eV for the carbon K-edge). Within density functional theory, the discrepancy correlates to the exchange interaction involving the core orbitals of the same spin symmetry as the delocalized core-hole. The use of a localized core-hole allows for a reasonably good inclusion of relaxation at lower level of theory, whereas the proper symmetry solution involving a delocalized core-hole requires higher levels of theory to account for the correlation effects involved in orbital relaxation. For linear response methods, we further show that if X-ray absorption spectra are modelled by considering symmetry-unique sets of atoms, care has to be taken such that there are no delocalizations of the core orbitals, which would otherwise introduce shifts in absolute energies and relative features.
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Affiliation(s)
- Iulia Emilia Brumboiu
- Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun Institute of Physics, Poland
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3
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Travnikova O, Kukk E, Hosseini F, Granroth S, Itälä E, Marchenko T, Guillemin R, Ismail I, Moussaoui R, Journel L, Bozek J, Püttner R, Krasnov P, Kimberg V, Gel'mukhanov F, Piancastelli MN, Simon M. Ultrafast dissociation of ammonia: Auger Doppler effect and redistribution of the internal energy. Phys Chem Chem Phys 2022; 24:5842-5854. [PMID: 35195639 DOI: 10.1039/d1cp05499f] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study vibrationally-resolved resonant Auger (RAS) spectra of ammonia recorded in coincidence with the NH2+ fragment, which is produced in the course of dissociation either in the core-excited 1s-14a11 intermediate state or the first spectator 3a-24a11 final state. Correlation of the NH2+ ion flight times with electron kinetic energies allows directly observing the Auger-Doppler dispersion for each vibrational state of the fragment. The median distribution of the kinetic energy release EKER, derived from the coincidence data, shows three distinct branches as a function of Auger electron kinetic energy Ee: Ee + 1.75EKER = const for the molecular band; EKER = const for the fragment band; and Ee + EKER = const for the region preceding the fragment band. The deviation of the molecular band dispersion from Ee + EKER = const is attributed to the redistribution of the available energy to the dissociation energy and excitation of the internal degrees of freedom in the molecular fragment. We found that for each vibrational line the dispersive behavior of EKERvs. Ee is very sensitive to the instrumental uncertainty in the determination of EKER causing the competition between the Raman (EKER + Ee = const) and Auger (Ee = const) dispersions: increase in the broadening of the finite kinetic energy release resolution leads to a change of the dispersion from the Raman to the Auger one.
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Affiliation(s)
- Oksana Travnikova
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
| | - Edwin Kukk
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Farzad Hosseini
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France. .,Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette Cedex, France
| | - Sari Granroth
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Eero Itälä
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Tatiana Marchenko
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
| | - Renaud Guillemin
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
| | - Iyas Ismail
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
| | - Roba Moussaoui
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
| | - Loïc Journel
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
| | - John Bozek
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Ralph Püttner
- Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Pavel Krasnov
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, 10691 Stockholm, Sweden.,International Research Center of Spectroscopy and Quantum Chemistry - IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Victor Kimberg
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, 10691 Stockholm, Sweden.,International Research Center of Spectroscopy and Quantum Chemistry - IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Faris Gel'mukhanov
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, 10691 Stockholm, Sweden.,International Research Center of Spectroscopy and Quantum Chemistry - IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia.,Institute for Methods and Instrumentation in Synchrotron Radiation Research FG-ISRR, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Maria Novella Piancastelli
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France. .,Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden
| | - Marc Simon
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France.
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4
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Boudjemia N, Jänkälä K, Püttner R, Marchenko T, Travnikova O, Guillemin R, Journel L, Ismail I, Koulentianos D, Kosugi S, Azuma Y, Patanen M, Huttula M, Céolin D, Piancastelli MN, Simon M. Electron spectroscopy and dynamics of HBr around the Br 1s -1 threshold. Phys Chem Chem Phys 2020; 22:26806-26818. [PMID: 33227117 DOI: 10.1039/d0cp04787b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comprehensive electron spectroscopic study combined with partial electron yield measurements around the Br 1s ionization threshold of HBr at ≅13.482 keV is reported. In detail, the Br 1s-1 X-ray absorption spectrum, the 1s-1 photoelectron spectrum as well as the normal and resonant KLL Auger spectra are presented. Moreover, the L-shell Auger spectra measured with photon energies below and above the Br 1s-1 ionization energy as well as on top of the Br 1s-1σ* resonance are shown. The latter two Auger spectra represent the second step of the decay cascade subsequent to producing a Br 1s-1 core hole. The measurements provide information on the electron and nuclear dynamics of deep core-excited states of HBr on the femtosecond timescale. From the different spectra the lifetime broadening of the Br 1s-1 single core-hole state as well as of the Br(2s-2,2s-12p-1,2p-2) double core-hole states are extracted and discussed. The slope of the strongly dissociative HBr 2p-2σ* potential energy curve is found to be about -13.60 eV Å-1. The interpretation of the experimental data, and in particular the assignment of the spectral features in the KLL and L-shell Auger spectra, is supported by relativistic calculations for HBr molecule and atomic Br.
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Affiliation(s)
- Nacer Boudjemia
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland.
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5
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A Perspective on Molecular Structure and Bond-Breaking in Radiation Damage in Serial Femtosecond Crystallography. CRYSTALS 2020. [DOI: 10.3390/cryst10070585] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
X-ray free-electron lasers (XFELs) have a unique capability for time-resolved studies of protein dynamics and conformational changes on femto- and pico-second time scales. The extreme intensity of X-ray pulses can potentially cause significant modifications to the sample structure during exposure. Successful time-resolved XFEL crystallography depends on the unambiguous interpretation of the protein dynamics of interest from the effects of radiation damage. Proteins containing relatively heavy elements, such as sulfur or metals, have a higher risk for radiation damage. In metaloenzymes, for example, the dynamics of interest usually occur at the metal centers, which are also hotspots for damage due to the higher atomic number of the elements they contain. An ongoing challenge with such local damage is to understand the residual bonding in these locally ionized systems and bond-breaking dynamics. Here, we present a perspective on radiation damage in XFEL experiments with a particular focus on the impacts for time-resolved protein crystallography. We discuss recent experimental and modelling results of bond-breaking and ion motion at disulfide bonding sites in protein crystals.
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6
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Piancastelli MN, Marchenko T, Guillemin R, Journel L, Travnikova O, Ismail I, Simon M. Hard x-ray spectroscopy and dynamics of isolated atoms and molecules: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2020; 83:016401. [PMID: 31694003 DOI: 10.1088/1361-6633/ab5516] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We present here a review of the most significant recent achievements in the field of HAXPES (hard x-ray photoelectron spectroscopy) on isolated atoms and molecules, and related spectroscopies. The possibility of conducting hard x-ray photoexcitation and photoionization experiments under state-of-the art conditions in terms of photon and electron kinetic energy resolution has become available only in the last few years. HAXPES has then produced structural and dynamical information at the level of detail already reached in the VUV and soft-x-ray ranges. The much improved experimental conditions have allowed extending to the hard x-ray range some methods well established in soft x-ray spectroscopies. Investigations of electron and nuclear dynamics in the femtosecond (fs, 10-15 s) and even attosecond (as, 10-18 s) regime have become feasible. Complex relaxation phenomena following deep-core ionization can now be enlightened in great detail. Other phenomena like e.g. recoil-induced effects are much more important in fast photoelectron emission, which can be induced by hard x-rays. Furthermore, a new kind of ionic states with double core holes can be observed by x-ray single-photon absorption. Future perspectives are also discussed.
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Affiliation(s)
- M N Piancastelli
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris, France. Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
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7
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Iwayama H, Léonard C, Le Quéré F, Carniato S, Guillemin R, Simon M, Piancastelli MN, Shigemasa E. Different Time Scales in the Dissociation Dynamics of Core-Excited CF_{4} by Two Internal Clocks. PHYSICAL REVIEW LETTERS 2017; 119:203203. [PMID: 29219361 DOI: 10.1103/physrevlett.119.203203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Indexed: 06/07/2023]
Abstract
Fragmentation processes following C 1s→lowest unoccupied molecular orbital core excitations in CF_{4} have been analyzed on the ground of the angular distribution of the CF_{3}^{+} emitted fragments by means of Auger electron-photoion coincidences. Different time scales have been enlightened, which correspond to either ultrafast fragmentation, on the few-femtosecond scale, where the molecule has no time to rotate and the fragments are emitted according to the maintained orientation of the core-excited species, or dissociation after resonant Auger decay, where the molecule still keeps some memory of the excitation process before reassuming random orientation. Potential energy surfaces of the ground, core-excited, and final states have been calculated at the ab initio level, which show the dissociative nature of the neutral excited state, leading to ultrafast dissociation, as well as the also dissociative nature of some of the final ionic states reached after resonant Auger decay, yielding the same fragments on a much longer time scale.
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Affiliation(s)
- H Iwayama
- UVSOR Synchrotron Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
| | - C Léonard
- Laboratoire Modélisation et Simulation Multi Echelle UMR 8208 CNRS, Université Paris-Est Marne-la-Vallée, F-77454 Marne-la-Vallée, France
| | - F Le Quéré
- Laboratoire Modélisation et Simulation Multi Echelle UMR 8208 CNRS, Université Paris-Est Marne-la-Vallée, F-77454 Marne-la-Vallée, France
| | - S Carniato
- Sorbonne Universités, UPMC Univ Paris 6, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - R Guillemin
- Sorbonne Universités, UPMC Univ Paris 6, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - M Simon
- Sorbonne Universités, UPMC Univ Paris 6, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - M N Piancastelli
- Sorbonne Universités, UPMC Univ Paris 6, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - E Shigemasa
- UVSOR Synchrotron Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
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8
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Travnikova O, Sisourat N, Marchenko T, Goldsztejn G, Guillemin R, Journel L, Céolin D, Ismail I, Lago AF, Püttner R, Piancastelli MN, Simon M. Subfemtosecond Control of Molecular Fragmentation by Hard X-Ray Photons. PHYSICAL REVIEW LETTERS 2017; 118:213001. [PMID: 28598654 DOI: 10.1103/physrevlett.118.213001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Indexed: 06/07/2023]
Abstract
Tuning hard x-ray excitation energy along Cl 1s→σ^{*} resonance in gaseous HCl allows manipulating molecular fragmentation in the course of the induced multistep ultrafast dissociation. The observations are supported by theoretical modeling, which shows a strong interplay between the topology of the potential energy curves, involved in the Auger cascades, and the so-called core-hole clock, which determines the time spent by the system in the very first step. The asymmetric profile of the fragmentation ratios reflects different dynamics of nuclear wave packets dependent on the photon energy.
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Affiliation(s)
- O Travnikova
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - N Sisourat
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - T Marchenko
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - G Goldsztejn
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - R Guillemin
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - L Journel
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - D Céolin
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - I Ismail
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - A F Lago
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), 09210-170 Santo André, São Paulo, Brazil
| | - R Püttner
- Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
| | - M N Piancastelli
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - M Simon
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
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9
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Travnikova O, Marchenko T, Goldsztejn G, Jänkälä K, Sisourat N, Carniato S, Guillemin R, Journel L, Céolin D, Püttner R, Iwayama H, Shigemasa E, Piancastelli MN, Simon M. Hard-X-Ray-Induced Multistep Ultrafast Dissociation. PHYSICAL REVIEW LETTERS 2016; 116:213001. [PMID: 27284654 DOI: 10.1103/physrevlett.116.213001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Indexed: 06/06/2023]
Abstract
Creation of deep core holes with very short (τ≤1 fs) lifetimes triggers a chain of relaxation events leading to extensive nuclear dynamics on a few-femtosecond time scale. Here we demonstrate a general multistep ultrafast dissociation on an example of HCl following Cl 1s→σ^{*} excitation. Intermediate states with one or multiple holes in the shallower core electron shells are generated in the course of the decay cascades. The repulsive character and large gradients of the potential energy surfaces of these intermediates enable ultrafast fragmentation after the absorption of a hard x-ray photon.
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Affiliation(s)
- Oksana Travnikova
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Tatiana Marchenko
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Gildas Goldsztejn
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Kari Jänkälä
- Centre for Molecular Materials Research, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
| | - Nicolas Sisourat
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Stéphane Carniato
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Renaud Guillemin
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Loïc Journel
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| | - Denis Céolin
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Ralph Püttner
- Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Hiroshi Iwayama
- UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
| | - Eiji Shigemasa
- UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
| | - Maria Novella Piancastelli
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - Marc Simon
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
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10
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Goldsztejn G, Marchenko T, Céolin D, Journel L, Guillemin R, Rueff JP, Kushawaha RK, Püttner R, Piancastelli MN, Simon M. Electronic state-lifetime interference in resonant Auger spectra: a tool to disentangle overlapping core-excited states. Phys Chem Chem Phys 2016; 18:15133-42. [DOI: 10.1039/c6cp01998f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thanks to a new fit approach, electronic state-lifetime interference terms are extracted and used to disentangle overlapping states.
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Affiliation(s)
| | | | - Denis Céolin
- Synchrotron SOLEIL
- F-91192 Gif-sur-Yvette Cedex
- France
| | - Loïc Journel
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS, UMR 7614
- Paris
- France
| | | | | | | | - Ralph Püttner
- Institut für Experimentalphysik
- Freie Universität Berlin
- D-14195 Berlin
- Germany
| | | | - Marc Simon
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS, UMR 7614
- Paris
- France
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11
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Miao Q, Travnikova O, Gel'mukhanov F, Kimberg V, Sun YP, Thomas TD, Nicolas C, Patanen M, Miron C. Rotational Doppler Effect: A Probe for Molecular Orbitals Anisotropy. J Phys Chem Lett 2015; 6:1568-1572. [PMID: 26263315 DOI: 10.1021/acs.jpclett.5b00325] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The vibrationally resolved X-ray photoelectron spectra of X2Σg+(3σg−1) and B2Σu+(2σu−1) states of N2+ were recorded for different photon energies and orientations of the polarization vector. Clear dependencies of the spectral line widths on the X-ray polarization as well as on the symmetry of the final electronic states are observed. Contrary to the translational Doppler, the rotational Doppler broadening is sensitive to the photoelectron emission anisotropy. On the basis of theoretical modeling, we suggest that the different rotational Doppler broadenings observed for gerade and ungerade final states result from a Young's double-slit interference phenomenon.
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Affiliation(s)
- Quan Miao
- †Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, Roslagstullsbacken 15, S-10691 Stockholm, Sweden
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
- §College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qianwangang Road 579, Qingdao 266590 Shandong, People's Republic of China
| | - Oksana Travnikova
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Faris Gel'mukhanov
- †Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, Roslagstullsbacken 15, S-10691 Stockholm, Sweden
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Victor Kimberg
- †Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, Roslagstullsbacken 15, S-10691 Stockholm, Sweden
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Yu-Ping Sun
- †Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, Roslagstullsbacken 15, S-10691 Stockholm, Sweden
- ∥School of Science, Shandong University of Technology, Xincunxi Road 266, ZiBo, 255049 Shandong, China
| | - T Darrah Thomas
- ⊥Department of Chemistry, Oregon State University, 153A Gilbert Hall, 2100 SW Campus Way, Corvallis, Oregon 97331, United States
| | - Christophe Nicolas
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Minna Patanen
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Catalin Miron
- ‡Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
- #Extreme Light Infrastructure - Nuclear Physics (ELI-NP), "Horia Hulubei" National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, RO-077125 Măgurele, Jud. Ilfov, Romania
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12
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Guillemin R, Decleva P, Stener M, Bomme C, Marin T, Journel L, Marchenko T, Kushawaha RK, Jänkälä K, Trcera N, Bowen KP, Lindle DW, Piancastelli MN, Simon M. Selecting core-hole localization or delocalization in CS2 by photofragmentation dynamics. Nat Commun 2015; 6:6166. [PMID: 25607354 DOI: 10.1038/ncomms7166] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 12/19/2014] [Indexed: 12/13/2022] Open
Abstract
Electronic core levels in molecules are highly localized around one atomic site. However, in single-photon ionization of symmetric molecules, the question of core-hole localization versus delocalization over two equivalent atoms has long been debated as the answer lies at the heart of quantum mechanics. Here, using a joint experimental and theoretical study of core-ionized carbon disulfide (CS2), we demonstrate that it is possible to experimentally select distinct molecular-fragmentation pathways in which the core hole can be considered as either localized on one sulfur atom or delocalized between two indistinguishable sulfur atoms. This feat is accomplished by measuring photoelectron angular distributions within the frame of the molecule, directly probing entanglement or disentanglement of quantum pathways as a function of how the molecule dissociates.
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Affiliation(s)
- R Guillemin
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - P Decleva
- 1] Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy [2] Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali Unita' di Trieste, 34127 Trieste, Italy [3] CNR-IOM DEMOCRITOS, 34149 Trieste, Italy
| | - M Stener
- 1] Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy [2] Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali Unita' di Trieste, 34127 Trieste, Italy [3] CNR-IOM DEMOCRITOS, 34149 Trieste, Italy
| | - C Bomme
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - T Marin
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - L Journel
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - T Marchenko
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - R K Kushawaha
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - K Jänkälä
- Department of Physics, University of Oulu, Box 3000, 90014 Oulu, Finland
| | - N Trcera
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - K P Bowen
- Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA
| | - D W Lindle
- Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA
| | - M N Piancastelli
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [3] Department of Physics and Astronomy, Uppsala University, PO Box 516, 75120 Uppsala, Sweden
| | - M Simon
- 1] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France [2] CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
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13
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Atomic Auger Doppler effects upon emission of fast photoelectrons. Nat Commun 2014; 5:4069. [PMID: 24906107 DOI: 10.1038/ncomms5069] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Accepted: 05/07/2014] [Indexed: 11/08/2022] Open
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14
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Site-selective photoemission from delocalized valence shells induced by molecular rotation. Nat Commun 2014; 5:3816. [DOI: 10.1038/ncomms4816] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Accepted: 04/07/2014] [Indexed: 01/11/2023] Open
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15
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Lindblad A, Söderström J, Nicolas C, Robert E, Miron C. A multi purpose source chamber at the PLEIADES beamline at SOLEIL for spectroscopic studies of isolated species: cold molecules, clusters, and nanoparticles. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:113105. [PMID: 24289386 DOI: 10.1063/1.4829718] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
This paper describes the philosophy and design goals regarding the construction of a versatile sample environment: a source capable of producing beams of atoms, molecules, clusters, and nanoparticles in view of studying their interaction with short wavelength (vacuum ultraviolet and x-ray) synchrotron radiation. In the design, specific care has been taken of (a) the use standard components, (b) ensuring modularity, i.e., that swiftly switching between different experimental configurations was possible. To demonstrate the efficiency of the design, proof-of-principle experiments have been conducted by recording x-ray absorption and photoelectron spectra from isolated nanoparticles (SiO2) and free mixed clusters (Ar/Xe). The results from those experiments are showcased and briefly discussed.
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Affiliation(s)
- Andreas Lindblad
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
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16
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Scholz M, Holch F, Sauer C, Wiessner M, Schöll A, Reinert F. Core hole-electron correlation in coherently coupled molecules. PHYSICAL REVIEW LETTERS 2013; 111:048102. [PMID: 23931410 DOI: 10.1103/physrevlett.111.048102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Indexed: 06/02/2023]
Abstract
We study the core hole-electron correlation in coherently coupled molecules by energy dispersive near edge x-ray absorption fine-structure spectroscopy. In a transient phase, which exists during the transition between two bulk arrangements, 1,4,5,8-naphthalene-tetracarboxylicacid-dianhydride multilayer films exhibit peculiar changes of the line shape and energy position of the x-ray absorption signal at the C K-edge with respect to the bulk and gas phase spectra. By a comparison to a theoretical model based on a coupling of transition dipoles, which is established for optical absorption, we demonstrate that the observed spectroscopic differences can be explained by an intermolecular delocalized core hole-electron pair. By applying this model we can furthermore quantify the coherence length of the delocalized core exciton.
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Affiliation(s)
- M Scholz
- Experimentelle Physik VII and Röntgen Research Center for Complex Material Systems RCCM, Universität Würzburg, 97074 Würzburg, Germany.
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17
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Piancastelli MN, Guillemin R, Simon M, Iwayama H, Shigemasa E. Ultrafast dynamics in C 1s core-excited CF4 revealed by two-dimensional resonant Auger spectroscopy. J Chem Phys 2013; 138:234305. [PMID: 23802958 DOI: 10.1063/1.4810871] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Following core excitation in an isolated molecule, ultrafast dissociation of one particular chemical bond can occur, where "ultrafast" is defined as taking place during the lifetime of the core hole, of the order of few femtoseconds. The signature of such phenomenon can be observed in resonant Auger spectra following core excitation. We present here an investigation of ultrafast dissociation following C 1s-to-σ* core excitation in CF4, with high-resolution resonant Auger spectroscopy. We are able to characterize final states of both the molecular ion and the CF3 (+) fragment. We use two-dimensional (2D) maps to record resonant Auger spectra across the resonance as a function of photon energy and to characterize ultrafast dynamics. This method provides immediate visual evidence of one of the important characteristics of the study of spectral features related to molecular versus fragment ionic final states, and namely their dispersion law. In the 2D maps we are also able to identify the dissociation limit for one of the molecular final states.
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Affiliation(s)
- M N Piancastelli
- Laboratoire de Chimie Physique-Matière et Rayonnement, UPMC, Université Paris 06, CNRS, UMR 7614, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France.
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18
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Liu XJ, Nicolas C, Miron C. Design of a lens table for a double toroidal electron spectrometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:033105. [PMID: 23556805 DOI: 10.1063/1.4794440] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report here on the method we developed to build a lens table for a four-element electrostatic transfer lens operated together with a double toroidal electron energy analyzer designed by one of us, and whose original design and further improvements are described in detail in Miron et al. [Rev. Sci. Instrum. 68, 3728 (1997)] and Le Guen et al. [Rev. Sci. Instrum. 73, 3885 (2002)]. Both computer simulations and laboratory instrument tuning were performed in order to build this lens table. The obtained result was tested for a broad range of electron kinetic energies and analyzer pass energies. Based on this new lens table, allowing to easily computer control the spectrometer working conditions, we could routinely achieve an electron energy resolution ranging between 0.6% and 0.8% of the analyzer pass energy, while the electron count rate was also significantly improved. The establishment of such a lens table is of high importance to relieve experimentalists from the tedious laboring of the lens optimization, which was previously necessary prior to any measurement. The described method can be adapted to any type of electron/ion energy analyzer, and will thus be interesting for all experimentalists who own, or plan to build or improve their charged particle energy analyzers.
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Affiliation(s)
- Xiao-Jing Liu
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France.
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19
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Miao Q, Liu JC, Ågren H, Rubensson JE, Gel'mukhanov F. Dissociative x-ray lasing. PHYSICAL REVIEW LETTERS 2012; 109:233905. [PMID: 23368206 DOI: 10.1103/physrevlett.109.233905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 06/25/2012] [Indexed: 06/01/2023]
Abstract
X-ray lasing is predicted to ensue when molecules are pumped into dissociative core-excited states by a free-electron-laser pulse. The lasing is due to the population inversion created in the neutral dissociation product, and the process features self-trapping of the x-ray pulse at the gain ridge. Simulations performed for the HCl molecule pumped at the 2p(1/2)→6σ resonance demonstrate that the scheme can be used to create ultrashort coherent x-ray pulses.
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Affiliation(s)
- Q Miao
- Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden.
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20
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Weimar R, Romberg R, Naydenov B, Menzel D, Feulner P. Dynamics of ultrafast dissociation of hydrogenic molecules by resonant antibonding core electron excitation: Conclusions from detuning dependence of H+- kinetic energy distributions from condensed films. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.05.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Travnikova O, Liu JC, Lindblad A, Nicolas C, Söderström J, Kimberg V, Gel'mukhanov F, Miron C. Circularly polarized x rays: another probe of ultrafast molecular decay dynamics. PHYSICAL REVIEW LETTERS 2010; 105:233001. [PMID: 21231455 DOI: 10.1103/physrevlett.105.233001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Indexed: 05/30/2023]
Abstract
Dissociative nuclear motion in core-excited molecular states leads to a splitting of the fragment Auger lines: the Auger-Doppler effect. We present here for the first time experimental evidence for an Auger-Doppler effect following F1s → a(1g)* inner-shell excitation by circularly polarized x rays in SF(6). In spite of a uniform distribution of the dissociating S-F bonds near the polarization plane of the light, the intersection between the subpopulation of molecules selected by the core excitation with the cone of dissociation induces a strong anisotropy in the distribution of the S-F bonds that contributes to the scattering profile measured in the polarization plane.
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Affiliation(s)
- Oksana Travnikova
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
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22
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Miron C, Kimberg V, Morin P, Nicolas C, Kosugi N, Gavrilyuk S, Gel'mukhanov F. Vibrational scattering anisotropy generated by multichannel quantum interference. PHYSICAL REVIEW LETTERS 2010; 105:093002. [PMID: 20868156 DOI: 10.1103/physrevlett.105.093002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2010] [Indexed: 05/29/2023]
Abstract
Based on angularly and vibrationally resolved electron spectroscopy measurements in acetylene, we report the first observation of anomalously strong vibrational anisotropy of resonant Auger scattering through the C 1s→π* excited state. We provide a theoretical model explaining the new phenomenon by three coexisting interference effects: (i) interference between resonant and direct photoionization channels, (ii) interference of the scattering channels through the core-excited bending states with orthogonal orientation of the molecular orbitals, (iii) scattering through two wells of the double-well bending mode potential. The interplay of nuclear and electronic motions offers in this case a new type of nuclear wave packet interferometry sensitive to the anisotropy of nuclear dynamics: whether which-path information is available or not depends on the final vibrational state serving for path selection.
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Affiliation(s)
- Catalin Miron
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
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23
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Céolin D, Piancastelli MN, Stolte WC, Lindle DW. Partial ion yield spectroscopy around the Cl 2p and C 1s ionization thresholds in CF3Cl. J Chem Phys 2009; 131:244301. [DOI: 10.1063/1.3274642] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Suzuki IH, Nitta A, Fukuzawa H, Ueda K, Takahashi O, Tamenori Y, Nagaoka S. Site-specific behavior in de-excitation spectra of F(3)SiCH(2)CH(2)Si(CH(3))(3) in the Si 1s excitation region. J Chem Phys 2009; 131:164309. [PMID: 19894949 DOI: 10.1063/1.3257639] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Excitation (total ion yield) and de-excitation (resonant photoemission) spectra have been measured in the Si 1s photoexcitation region of the F(3)SiCH(2)CH(2)Si(CH(3))(3) molecule using monochromatized undulator radiation. Theoretical calculations within the framework of density functional theory have reproduced the observed total ion yield spectrum very well. The first peak at the lowest photon energy, coming from Si 1s excitation at the trimethyl side into a vacant orbital, induces spectator Auger decays in which the excited electron remains in its valence orbital. The second peak produced through excitation of Si 1s electron at the trifluoride side generates resonant Auger decays in which the excited valence electron remains predominantly also in the valence orbital or is partly shaken up into higher Rydberg orbitals. The third peak generated through Si 1s excitation at the trifluoride side produces resonant Auger decays in which the excited Rydberg electron remains or is partly shaken down to a lower lying valence molecular orbital. These findings exhibit a clear distinction between resonant Auger decays following photoexcitation of Si 1s electrons under different chemical environments.
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Affiliation(s)
- I H Suzuki
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan.
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25
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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: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [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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26
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Feifel R, Velkov Y, Carravetta V, Angeli C, Cimiraglia R, Sałek P, Gel'mukhanov F, Sorensen SL, Piancaśtelli MN, De Fanis A, Okada K, Kitajima M, Tanaka T, Tanaka H, Ueda K. X-ray absorption and resonant Auger spectroscopy of O2 in the vicinity of the O 1s-->sigma* resonance: experiment and theory. J Chem Phys 2008; 128:064304. [PMID: 18282035 DOI: 10.1063/1.2831920] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report on an experimental and theoretical investigation of x-ray absorption and resonant Auger electron spectra of gas phase O(2) recorded in the vicinity of the O 1s-->sigma(*) excitation region. Our investigation shows that core excitation takes place in a region with multiple crossings of potential energy curves of the excited states. We find a complete breakdown of the diabatic picture for this part of the x-ray absorption spectrum, which allows us to assign an hitherto unexplained fine structure in this spectral region. The experimental Auger data reveal an extended vibrational progression, for the outermost singly ionized X (2)Pi(g) final state, which exhibits strong changes in spectral shape within a short range of photon energy detuning (0 eV>Omega>-0.7 eV). To explain the experimental resonant Auger electron spectra, we use a mixed adiabatic/diabatic picture selecting crossing points according to the strength of the electronic coupling. Reasonable agreement is found between experiment and theory even though the nonadiabatic couplings are neglected. The resonant Auger electron scattering, which is essentially due to decay from dissociative core-excited states, is accompanied by strong lifetime-vibrational and intermediate electronic state interferences as well as an interference with the direct photoionization channel. The overall agreement between the experimental Auger spectra and the calculated spectra supports the mixed diabatic/adiabatic picture.
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Affiliation(s)
- R Feifel
- Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
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27
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Miron C, Morin P, Céolin D, Journel L, Simon M. Multipathway dissociation dynamics of core-excited methyl chloride probed by high resolution electron spectroscopy and Auger-electron–ion coincidences. J Chem Phys 2008; 128:154314. [DOI: 10.1063/1.2900645] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Sorensen S, Miron C, Feifel R, Piancastelli MN, Björneholm O, Svensson S. The influence of the σ resonance on the Auger decay of core-ionized molecular nitrogen. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.03.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Feifel R, Tanaka T, Kitajima M, Tanaka H, De Fanis A, Sankari R, Karlsson L, Sorensen S, Piancastelli MN, Prümper G, Hergenhahn U, Ueda K. Probing the valence character of O 1s→Rydberg excited O2 by participator Auger decay measurements and partial ion yield spectroscopy following x-ray absorption. J Chem Phys 2007; 126:174304. [PMID: 17492860 DOI: 10.1063/1.2723745] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The valence character of O 1s-->Rydberg excited O2 is investigated by means of participator Auger decay spectroscopy, performed at selected photon energies across the K-shell resonance region, and by means of partial ion yield x-ray absorption spectroscopy. For several of the excitation energies studied, the authors find substantial sigma*(4Sigmau-, 2Sigmau-) valence character being mixed with nssigma and npsigma (4Sigmau-, 2Sigmau-) Rydberg states. An experimental indication of a coupling between the channels associated with quartet and doublet ion cores is considered and discussed. New spectroscopic constants are derived for the singly ionized X 2Pig state of O2 based on the observation of at least 20 vibrational sublevels.
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Affiliation(s)
- R Feifel
- Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden
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Lago AF, Dávalos JZ, Kerdpin U, Schlachter AS. Cationic and Anionic Fragmentation of Dichloromethane following Inner-Shell (Cl 1s) Photoexcitation. J Phys Chem A 2006; 110:13717-23. [PMID: 17181326 DOI: 10.1021/jp063423h] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The cationic and anionic fragmentation of dichloromethane (CH2Cl2) molecule have been investigated in the energy range of the Cl K shell by using synchrotron radiation, ion yield spectroscopy, and electron-ion coincidence spectroscopy. Total and partial ion-yield and mass spectra have been recorded as a function of the photon energy. We were able to identify several singly and multiply charged cationic fragments and the following anionic species: H-; C-; Cl-. The present results provide the first experimental report of negative ion formation from a molecule excited at the Cl 1s edge. In addition, our electron-ion coincidence data provide strong evidence of the preservation of molecular alignment for the photodissociation of CH2Cl2 after deep core-electron resonant excitation.
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Affiliation(s)
- A F Lago
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, USA.
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31
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Mondal S, Singh RK, Shanker R. Doppler effect in fluorine K-Auger line produced in electron-induced core ionization of SF6. J Chem Phys 2006; 124:034301. [PMID: 16438577 DOI: 10.1063/1.2158995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
An experimental evidence is reported on the observation of the Doppler effect in fluorine K-Auger line emitted from a core-ionized SF6 molecule under an impact of 16 keV electrons. The emitting source of the Auger line is found to acquire a kinetic energy of 4.7+/-0.3 keV. We propose that such large energy is released from the Coulomb repulsion taking place between F+ and SF5+ fragment ions under influence of an intense focusing field of the incident electrons. In the presence of the Coulomb field of these ions, the Auger line obtains a polarization P = 76%+/-7%.
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Affiliation(s)
- S Mondal
- Atomic Physics Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221 005, India
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32
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Rolles D, Braune M, Cvejanović S, Gessner O, Hentges R, Korica S, Langer B, Lischke T, Prümper G, Reinköster A, Viefhaus J, Zimmermann B, McKoy V, Becker U. Isotope-induced partial localization of core electrons in the homonuclear molecule N2. Nature 2005; 437:711-5. [PMID: 16193047 DOI: 10.1038/nature04040] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2005] [Accepted: 07/11/2005] [Indexed: 11/08/2022]
Abstract
Because of inversion symmetry and particle exchange, all constituents of homonuclear diatomic molecules are in a quantum mechanically non-local coherent state; this includes the nuclei and deep-lying core electrons. Hence, the molecular photoemission can be regarded as a natural double-slit experiment: coherent electron emission originates from two identical sites, and should give rise to characteristic interference patterns. However, the quantum coherence is obscured if the two possible symmetry states of the electronic wavefunction ('gerade' and 'ungerade') are degenerate; the sum of the two exactly resembles the distinguishable, incoherent emission from two localized core sites. Here we observe the coherence of core electrons in N(2) through a direct measurement of the interference exhibited in their emission. We also explore the gradual transition to a symmetry-broken system of localized electrons by comparing different isotope-substituted species--a phenomenon analogous to the acquisition of partial 'which-way' information in macroscopic double-slit experiments.
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Affiliation(s)
- Daniel Rolles
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
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33
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Hjelte I, Björneholm O, Carravetta V, Angeli C, Cimiraglia R, Wiesner K, Svensson S, Piancastelli MN. Constant-atomic-final-state filtering of dissociative states in the O1s→σ* core excitation in O2. J Chem Phys 2005; 123:64314. [PMID: 16122315 DOI: 10.1063/1.1995689] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The below-threshold region in core-excited O2 is very complex, consisting of a multitude of exchange-split states with mixed molecular orbital-Rydberg character. We have investigated the nature of these intermediate states by resonant Auger spectroscopy. In particular, we have obtained constant-atomic-final-state yield curves for several atomic peaks in the electron decay spectra which are stemming from ultrafast dissociation. The relative intensity of Auger decay leading to atomic final states is considered a signature of the relative weight of the sigma* character. This method allows one to "filter out" intermediate states with dissociative character. Extensive calculations have been performed by multi-reference configuration interaction at different interatomic distances in order to evaluate the potential curves of the core-excited states and propose a qualitative description of the dissociative molecular dynamics. The calculations show that the core-excited states have a relevant admixture of excitations to orbitals with Rydberg character and excitations to the sigma* orbital with different spin couplings. A diabatization of the adiabatic potential curves shows that the coupling between Rydberg and sigma* diabatic states is very different at the different crossing points and ultrafast dissociation occurs more easily on the lowest sigma* diabatic potential curve. As a consequence, the observation of atomic peaks only in the lower-energy region of the absorption curve is well justified.
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Affiliation(s)
- I Hjelte
- Physics Department, Uppsala University, Uppsala, Sweden
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34
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Kugeler O, Prümper G, Hentges R, Viefhaus J, Rolles D, Becker U, Marburger S, Hergenhahn U. Intramolecular electron scattering and electron transfer following autoionization in dissociating molecules. PHYSICAL REVIEW LETTERS 2004; 93:033002. [PMID: 15323819 DOI: 10.1103/physrevlett.93.033002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2004] [Indexed: 05/24/2023]
Abstract
Resonant Auger decay of core-excited molecules during ultrafast dissociation leads to a Doppler shift of the emitted electrons depending on the direction of the electron emission relative to the dissociation axis. We have investigated this process by angle-resolved electron-fragment ion coincidence spectroscopy. Electron energy spectra for selected emission angles for the electron relative to the molecular axis reveal the occurrence of intermolecular electron scattering and electron transfer following the primary emission. These processes amount to approximately 25% of the resonant atomic Auger intensity emitted in the studied transition.
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Affiliation(s)
- O Kugeler
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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Chen JM, Lu KT, Lee JM, Ma CI, Lee YY. State selective enhanced production of excited fragments and ionic fragments of gaseous Si(CH3)2Cl2 and solid-state analogs following core-level excitation. PHYSICAL REVIEW LETTERS 2004; 92:243002. [PMID: 15245080 DOI: 10.1103/physrevlett.92.243002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2003] [Indexed: 05/24/2023]
Abstract
State-selective fragmentation dynamics for excited fragments and ionic fragments of gaseous and condensed Si(CH3)2Cl2 following Cl 2p and Si 2p core-level excitations have been characterized. The Cl 2p-->15a1* excitation of Si(CH3)2Cl2 induces significant enhancement of the Cl+ desorption yield in the condensed phase and the Si(CH3)+2 and SiCH+3 yields in the gaseous phase. The core-to-Rydberg excitations at both Si 2p and Cl 2p edges lead to enhanced production of the excited fragments. These complementary results provide deeper insight into the origin of state-selective fragmentation of molecules via core-level excitation.
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Affiliation(s)
- J M Chen
- National Synchrotron Radiation Research Center, Hsinchu 3007, Taiwan, Republic of China
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37
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Kitajima M, Ueda K, De Fanis A, Furuta T, Shindo H, Tanaka H, Okada K, Feifel R, Sorensen SL, Gel'mukhanov F, Baev A, Agren H. Doppler effect in resonant photoemission from SF6: correlation between Doppler profile and Auger emission anisotropy. PHYSICAL REVIEW LETTERS 2003; 91:213003. [PMID: 14683296 DOI: 10.1103/physrevlett.91.213003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2003] [Indexed: 05/24/2023]
Abstract
Fragmentation of the SF6 molecule upon F 1s excitation has been studied by resonant photoemission. The F atomiclike Auger line exhibits the characteristic Doppler profile that depends on the direction of the photoelectron momentum relative to the polarization vector of the radiation as well as on the photon energy. The measured Doppler profiles are analyzed by the model simulation that takes account of the anisotropy of the Auger emission in the molecular frame. The Auger anisotropy extracted from the data decreases with an increase in the F-SF5 internuclear distance.
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Affiliation(s)
- M Kitajima
- Department of Physics, Sophia University, Tokyo 102-8554, Japan
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Ueda K, Kitajima M, De Fanis A, Furuta T, Shindo H, Tanaka H, Okada K, Feifel R, Sorensen SL, Yoshida H, Senba Y. Anisotropic ultrafast dissociation probed by the Doppler effect in resonant photoemission from CF4. PHYSICAL REVIEW LETTERS 2003; 90:233006. [PMID: 12857258 DOI: 10.1103/physrevlett.90.233006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2003] [Indexed: 05/24/2023]
Abstract
The resonant Auger spectrum from the decay of F 1s-excited CF4 is measured. Several lines exhibit a nondispersive kinetic energy as the exciting photon energy is tuned through the resonance region. The F 1s(-1) atomiclike Auger line is split into two components due to the emission of Auger electrons by a fragment in motion, when electron emission is observed along the polarization vector of the light. This Doppler splitting is direct evidence that the core excitation leads to T(d)-->C(3v) symmetry lowering, by elongation of a specific C-F bond preferentially aligned along the polarization vector of the incident photon.
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Affiliation(s)
- K Ueda
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
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Bozek J, Canton S, Kukk E, Berrah N. Vibrationally resolved resonant Auger spectroscopy of formaldehyde at the C resonance. Chem Phys 2003. [DOI: 10.1016/s0301-0104(02)01050-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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41
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Hjelte I, Piancastelli M, Jansson C, Wiesner K, Björneholm O, Bässler M, Sorensen S, Svensson S. Evidence of ultra-fast dissociation in ammonia observed by resonant Auger electron spectroscopy. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00161-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Sałek P, Baev A, Gel'mukhanov F, Ågren H. Dynamical properties of X-ray Raman scattering. Phys Chem Chem Phys 2003. [DOI: 10.1039/b209717f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Denning RG, Green JC, Hutchings TE, Dallera C, Tagliaferri A, Giarda K, Brookes NB, Braicovich L. Covalency in the uranyl ion: A polarized x-ray spectroscopic study. J Chem Phys 2002. [DOI: 10.1063/1.1510445] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Wiesner K, Naves de Brito A, Sorensen S, Burmeister F, Gisselbrecht M, Svensson S, Björneholm O. The dynamic Auger–Doppler effect in HF and DF: control of fragment velocities in femtosecond dissociation through photon energy detuning. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00144-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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45
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Sałek P, Carravetta V, Gel’mukhanov F, Ågren H. Theory and first principles calculations of dissociative resonant photoionization: The evolution of atomic peaks and holes. J Chem Phys 2002. [DOI: 10.1063/1.1423329] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Björneholm O. Direct and indirect methods for studying the energetics and dynamics of the Auger Doppler effect in femtosecond ultra-fast dissociation. J Chem Phys 2001. [DOI: 10.1063/1.1380690] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Rosenqvist L, Wiesner K, Naves de Brito A, Bässler M, Feifel R, Hjelte I, Miron C, Wang H, Piancastelli MN, Svensson S, Björneholm O, Sorensen SL. Femtosecond dissociation of ozone studied by the Auger Doppler effect. J Chem Phys 2001. [DOI: 10.1063/1.1385156] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Sałek P, Carravetta V, Gel'mukhanov F, Ågren H, Schimmelpfennig B, Piancastelli MN, Sorensen L, Feifel R, Hjelte I, Bässler M, Svensson S, Björneholm O, Naves de Brito A. Dynamical suppression of atomic peaks in resonant dissociative photoemission. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00667-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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49
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Flesch R, Pavlychev AA, Neville JJ, Blumberg J, Kuhlmann M, Tappe W, Senf F, Schwarzkopf O, Hitchcock AP, Rühl E. Dynamic stabilization in 1sigma(u)-->1pi(g) excited nitrogen clusters. PHYSICAL REVIEW LETTERS 2001; 86:3767-3770. [PMID: 11329319 DOI: 10.1103/physrevlett.86.3767] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2000] [Indexed: 05/23/2023]
Abstract
High-resolution 1s near-edge spectra of molecular nitrogen and variable size nitrogen clusters obtained using monochromatic synchrotron radiation from the high brilliance BESSY-II storage ring facility are reported. The vibrationally resolved 1sigma(u)-->1pi(g) core-to-valence excitation band of clusters shows a distinct redshift of 6+/-1 meV relative to the isolated molecule, but the vibrational structure and linewidths are essentially unchanged. This shift is assigned to dynamic stabilization of 1sigma(u)-->1pi(g) excited molecules in clusters, arising from the dynamic dipole moment generated by core-hole localization in the low-symmetry cluster field. This leads to changes in intermolecular interactions compared to the ground-state cluster. Such spectral shifts are expected to occur generally in molecular clusters and in the corresponding condensed phase.
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Affiliation(s)
- R Flesch
- Fachbereich Physik, Universität, Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
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50
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Sałek P, Gel'mukhanov F, Privalov T, Ågren H. Doppler effect for bound nuclear motion and its manifestation in resonant photoemission of oriented systems. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00945-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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