Strong Dependence of the 2p Photoionization Cross Sectionsof Na Atoms on Valence Electron State

Abstract

The cross sections and asymmetry parameters β of the 2pelectron single photoionization, shake-up and shake-down processesfrom Na atoms in the ground state and in a number of excited states2p6nl (n = 3, 4, 5 and l ≤ n–1) are calculated using a single channelrelaxed-orbital Hartree–Fock approximation. A strong dependenceof the calculated cross sections on the atomic orbit of the valenceelectron is found. The asymmetry parameters β are sensitive tothe excitation of the valence electron near the threshold ofphotoionization. The single photoionization of the 2p subshell of Naatoms in the 4d 2D, 5p 2P and 5f 2Fstates is found to be about 43, 150 and 105 times lessprobable respectively than the shake-up process.