H2+ formation from H2O+ mediated by the core-excitation-induced nuclear motion in H2O - Laboratoire de Chimie Physique-Matière et Rayonnement Accéder directement au contenu
Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2001

H2+ formation from H2O+ mediated by the core-excitation-induced nuclear motion in H2O

Résumé

We present direct evidence for ultra-fast dissociation of molecular water in connection photo-excitation of the O1s→4a1 resonance. The core-excited H2O molecules are shown to dissociate into core-excited O*H and neutral H on a time scale comparable to the core hole lifetime, i.e. a few femtoseconds. This conclusion is based on a resonant Auger study, qualitative arguments and ab initio calculations. ‘Hot bands' connected to Auger transitions from vibrationally excited OH fragments are identified, and these exhibit a dynamical behavior which qualitatively follows the change in excess energy.

Dates et versions

hal-00136817 , version 1 (15-03-2007)

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A. Hiraya, K. Nobusada, M. Simon, K. Okada, T. Tokushima, et al.. H2+ formation from H2O+ mediated by the core-excitation-induced nuclear motion in H2O. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2001, 334, pp.151-158. ⟨10.1103/PhysRevA.63.042705⟩. ⟨hal-00136817⟩
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