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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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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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