Different Time Scales in the Dissociation Dynamics of Core-Excited CF4 by Two Internal Clocks

H. Iwayama, C. Léonard, F. Le Quéré, S. Carniato, R. Guillemin, M. Simon, M. N. Piancastelli, and E. Shigemasa
Phys. Rev. Lett. 119, 203203 – Published 15 November 2017
PDFHTMLExport Citation

Abstract

Fragmentation processes following C 1slowest 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.

  • Figure
  • Figure
  • Figure
  • Received 17 February 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.203203

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

H. Iwayama1, C. Léonard2, F. Le Quéré2, S. Carniato3, R. Guillemin3, M. Simon3, M. N. Piancastelli3,4, and E. Shigemasa1

  • 1UVSOR Synchrotron Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
  • 2Laboratoire Modélisation et Simulation Multi Echelle UMR 8208 CNRS, Université Paris-Est Marne-la-Vallée, F-77454 Marne-la-Vallée, France
  • 3Sorbonne Universités, UPMC Univ Paris 6, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
  • 4Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 119, Iss. 20 — 17 November 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×