Double ionisation de la molécule d'eau par impact d'électrons

Abstract : In this work, double ionization mechanisms of oriented water molecules by electron impact have been studied. Five and forth fold differential cross sections in angle have been calculated and analyzed in a coplanar geometry. The theoretical investigation is performed within the first born approximation by describing the initial molecular state by means of single-center wave functions. The contributions of each final state to the double-ionization process, i.e., with target electrons ejected from similar and/or different molecular subshells, are studied and compared in terms of shape and magnitude. Strong dependence of the fivefold differential cross sections on the molecular target orientation is clearly observed in (e, 3-1e) as well as (e, 3e) channels. Furthermore, for the particular target orientations investigated, different mechanisms involved in the double ionization of water molecule, namely, the direct shake-off process as well as the two-step1 process
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Dahbia Oubaziz. Double ionisation de la molécule d'eau par impact d'électrons. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2011. Français. ⟨NNT : 2011METZ036S⟩. ⟨tel-01749089⟩

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