Eur. Phys. J. D (2013) 67: 65
https://doi.org/10.1140/epjd/e2013-30532-9

Regular Article

Angular anisotropy in valence photoionization of Na clusters: theoretical investigation using jellium model^*

Department of Physics, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland

^a Present address: Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany. e-mail: kari.jankala@oulu.fi

Received: 27 August 2012
Received in final form: 23 November 2012
Published online: 28 March 2013

Abstract

Calculation of the behaviour of photoelectron angular anisotropy in valence ionization of initially neutral Na_X (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.