H2S ultrafast dissociation probed by energy-selected resonant Auger electron–ion coincidence measurements

K. Le Guen (1, 2) , C. Miron (3) , D. Céolin (4) , R. Guillemin (2) , N. Leclercq (1) , M. Simon (2, 4) , Pascal Morin (1, 3) , A. Mocellin (5) , O. Björneholm (6) , A.N. de Brito (5) , S.L. Sorensen (7)

1 SSOLEIL - Synchrotron SOLEIL
2 LCPMR - Laboratoire de Chimie Physique - Matière et Rayonnement
3 LFP - URA 2453 - Laboratoire Francis PERRIN
4 LURE - Laboratoire pour l'utilisation du rayonnement électromagnétique
5 Institute of Physics
6 Department of Physics
7 Department of Synchrotron Radiation Research

We have studied the ultrafast dissociation of the H2S molecule upon S 2p3/26a1 inner-shell excitation by combining high-resolution resonant Auger spectroscopy and energy-selected Auger electron–ion coincidence measurements. Auger final states have been correlated to the different fragmentation pathways (S+, HS+, and H2S+ ions). As an original result, we evidence a three-step mechanism to describe the resonant production of S+: the Auger recombination in the HS* fragment is followed for the A 3 and c 1 states by the S++H fragmentation mechanism.

Mots clés: molecule-photon collisions; photodissociation; photoexcitation; Auger electron spectra; hydrogen compounds

Domaines: Chimie théorique et/ou physique

K. Le Guen, C. Miron, D. Céolin, R. Guillemin, N. Leclercq, et al.. H2S ultrafast dissociation probed by energy-selected resonant Auger electron–ion coincidence measurements. Journal of Chemical Physics, 2007, 127, pp.114315. ⟨10.1063/1.2776265⟩. ⟨hal-00151364⟩