Scattering angle-integrated (total) and magnetic sublevel cross-sections and degree of linear polarization for electron and proton induced excitation [HeI (1snp) P-1(0) (n=2-5)] of helium

摘要

Experimental scattering-angle-integrated (total) cross-sections a, (scattering) angle-integrated magnetic sublevel cross-sections (σ) over bar (M L), and degree of linear polarization data have been measured in the extreme ultraviolet (EUV) wavelength region following decay of HeI (lsnp) P-1(0) (n=2-5) states induced by electron and proton impact on a neutral helium target. These measurements are compared with a first Born approach as well as more sophisticated theoretical calculations. Specifically, theoretical values for electron impact include convergent close-coupling (CCC) and R-matrix with pseudo states (RMPS) methods in addition to first Born (Born 1) approximation while proton induced excitation cross-sections are compared with atomic-orbital close-coupling (AOCC) and first Born predictions. (C) 2003 Elsevier Science (USA). All rights reserved. [References: 30]