PHOTOIONIZATION OF THE 2P SUBSHELL OF SODIUM ATOMS IN-GROUND AND EXCITED-STATES

Photoionization cross sections and asymmetry parameters of photoelectr ons resulting from ionization in the 2p subshell of excited-state 2p(6 )3p P-3/2(2) and ground-state 2p(6)3s S-1/2(2) sodium atoms have been calculated using the multiconfiguration Hartree-Fock method over a lar ge photon energy range. Calculations of relative intensities and branc hing ratios for leaving the positive ions in various final states corr esponding to the main and satellite lines have been made and are compa red with the available experimental measurements. It is found that the re is a strong enhancement of the relative intensity of the shake-up s atellite in the excited atom, in agreement with experimental observati on. The asymmetry parameter beta in the excited state agrees well with a recent experimental measurement made at a single photon energy. Fur ther experimental work is needed to verify the theoretical results ove r a large photon energy range.