Eur. Phys. J. D (2014) 68: 50
https://doi.org/10.1140/epjd/e2014-40716-4

Regular Article

Electron (positron) impact excitation (2p state) of lithium at intermediate energies^*

¹ Centre for Foundation Studies in Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
² Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
³ Department of Physics, Faculty of Science, National University of Singapore, Singapore  

^a e-mail: mzmk2005@gmail.com

Received: 14 November 2013
Received in final form: 3 January 2014
Published online: 18 March 2014

Abstract

In this work, studies have been carried out to investigate theoretically the electron (positron)-impact-induced 2s → 2p lithium (Li) transition at 20 and 60 eV using the coupled-channel optical method (CCOM). The inelastic differential cross sections (DCS) together with the reduced Stokes parameters (, , ) and other parameters such as the alignment (γ, ), orientation (L_⊥) and coherence parameters (P⁺) are reported in the present calculations. Comparison is made with other available theoretical and experimental measurements.