Regular Article

Rearrangement of electron shells and interchannel interaction in the K photoabsorption of Ne^★

¹ Institute of Physics, Southern Federal University, 344090 Rostov-on-Don, Russia
² Rostov State Transport University, 344038 Rostov-on-Don, Russia
³ Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, 34132 Kassel, Germany

^a e-mail: vlsu16@mail.ru

Received: 30 September 2018
Received in final form: 21 November 2018
Published online: 5 February 2019

Abstract

A detailed theoretical analysis of the 1s photoionization of neon is presented. It is found that the most significant many-electron correlation in computing photoionization of inner shells is the rearrangement of the outer shells caused by the inner vacancy. Further noticeable effects are: (i) the polarization of the ion core by the outgoing photoelectron and (ii) the coherent effect of double excitation/ionization. The core polarization increases the photoionization cross section by about 10% at the 1s threshold, and the coherent excitation results in further increases by about 5%. Incoherent excitation of the satellite channel leads to an additional 10% increase in the photoabsorption cross section in the double-ionization threshold region.