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. © 2013 American Physical Society.
CITATION STYLE
Huismans, Y., Cormier, E., Cauchy, C., Hervieux, P. A., Gademann, G., Gijsbertsen, A., … Vrakking, M. J. J. (2013). Macro-atom versus many-electron effects in ultrafast ionization of C 60. Physical Review A - Atomic, Molecular, and Optical Physics, 88(1). https://doi.org/10.1103/PhysRevA.88.013201
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