Different Time Scales in the Dissociation Dynamics of Core-Excited CF_{4} by Two Internal Clocks.
Phys Rev Lett
; 119(20): 203203, 2017 Nov 17.
Article
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| MEDLINE
| ID: mdl-29219361
Fragmentation processes following C 1sâlowest 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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MEDLINE
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Phys Rev Lett
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2017
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Article
País de afiliación:
Japón