Eur. Phys. J. D (2013) 67: 152
https://doi.org/10.1140/epjd/e2013-40175-5

Regular Article

Relaxation effects in 2p photoionization of Ar isonuclear sequence

¹ School of Physics and Information Science, Tianshui Normal University, Tianshui 741001, P.R. China
² Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, P.R. China

^a e-mail: Liuxbtstc@sohu.com

Received: 27 March 2013
Received in final form: 23 May 2013
Published online: 24 July 2013

Abstract

The 2p photoionization cross sections of Ar, Ar⁶⁺ and Ar⁸⁺ have been investigated by the multiconfiguration Dirac-Fock method. Our results show excellent agreement with the previous measurements and calculations, the relaxation is not so important for inner subshells of neutral Ar and all subshells of Ar⁶⁺ and Ar⁸⁺ as generally accepted. In unrelaxed calculation, it is known that the inner-shell cross sections are essentially unchanged upon the presence or absence of outer electrons except for a shift in the corresponding thresholds. Specifically, the present results show that this is not entirely true, i.e., non-neglectable influence of the removal of outer electrons on the 2p cross sections is observed even when the relaxation effects are not considered, especially in energy region near the thresholds.