Angular anisotropy in valence photoionization of Na clusters: theoretical investigation using jellium model*
Department of Physics, University of
Oulu, P.O. Box
Present address: Institute for Experimental Physics, University of
Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Received in final form: 23 November 2012
Published online: 28 March 2013
Calculation of the behaviour of photoelectron angular anisotropy in valence ionization of initially neutral NaX (X = 34–58) clusters is provided. The calculations are carried out for 1p, 1d and 1g jellium orbitals as a function of photon energy. The adapted theoretical framework is spherical jellium model using Woods-Saxon potential, which is modified to account for the long-range Coulomb tail in the final state. We discuss on the observed dramatic variations of the angular anisotropy parameter β as a function incident photon energy. It is shown that the behaviour is connected to the oscillation of the valence photoionization cross sections, that is a specific interference property of such metallic clusters whose valence structure can be described using the jellium model.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013