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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2013

Macro-atom versus many-electron effects in ultrafast ionization of C 60

Résumé

Ionization mechanisms of C60 molecules irradiated by a short intense 800-nm laser pulse are studied. Angle-resolved photoelectron spectra show above-threshold ionization (ATI) patterns with a low peak contrast and a remarkably smooth angular distribution. The results are interpreted by combining two theoretical models. A time-dependent Schrödinger equation (TDSE) calculation based on the B-spline method that explicitly takes into account the molecular potential mimics the single-active-electron response while a statistical model accounts for the many-electron effects. We show that the latter are responsible for the loss of contrast in the ATI peaks. The smooth angular distribution arises in the TDSE calculation as a result of the high angular momentum of the C60 ground electronic state and therefore is a manifestation of the atomic behavior of the molecule.
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hal-03060530 , version 1 (14-12-2020)

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Y. Huismans, E. Cormier, C. Cauchy, Paul-Antoine Hervieux, G. Gademann, et al.. Macro-atom versus many-electron effects in ultrafast ionization of C 60. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2013, 88 (1), pp.013201. ⟨10.1103/PhysRevA.88.013201⟩. ⟨hal-03060530⟩
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