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Different Time Scales in the Dissociation Dynamics of Core-Excited CF4 by Two Internal Clocks
Inst Mol Sci, UVSOR Synchrotron Facil, Okazaki, Aichi 4448585, Japan..
Univ Paris Est Marne la Vallee, Lab Modelisat & Simulat Multi Echelle UMR CNRS 82, F-77454 Marne La Vallee, France..
Univ Paris Est Marne la Vallee, Lab Modelisat & Simulat Multi Echelle UMR CNRS 82, F-77454 Marne La Vallee, France..
UPMC Univ Paris 6, Sorbonne Univ, CNRS, Lab Chim Phys Matiere & Rayonnement,UMR 7614, F-75005 Paris, France..
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 20, article id 203203Article in journal (Refereed) Published
Abstract [en]

Fragmentation processes following C 1s -> lowest unoccupied molecular orbital core excitations in CF4 have been analyzed on the ground of the angular distribution of the CF3+ 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.

Place, publisher, year, edition, pages
2017. Vol. 119, no 20, article id 203203
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Atom and Molecular Physics and Optics
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URN: urn:nbn:se:uu:diva-342384DOI: 10.1103/PhysRevLett.119.203203ISI: 000415173500007PubMedID: 29219361OAI: oai:DiVA.org:uu-342384DiVA, id: diva2:1184794
Available from: 2018-02-22 Created: 2018-02-22 Last updated: 2018-02-22Bibliographically approved

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Piancastelli, Maria Novella

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