Chemical Physics Letters, Vol.510, No.1-3, 78-81, 2011
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
The ultrafast dissociation dynamics of condensed water and ammonia by resonant core electron excitations have been studied by measuring the kinetic energy distributions of H+-ions desorbed by [N1s]4a(1) and [O1s]4a(1) excitations as a function of detuning, Delta h nu, from the center of the resonance. While the most probable ion energy varies monotonically with Delta h nu for both systems, the centers of gravity of the kinetic energy distributions are minimal at resonance and shift to higher kinetic energy with detuning to either lower or higher h nu. This behavior is explained by contributions from bond evolution processes before and after the core hole decay. (C) 2011 Elsevier B.V. All rights reserved.