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VOLUME 78 (2003) | ISSUE 3 | PAGE 141
Double K-shell ionization of atoms by a single photon
PACS: 31.25.-v, 32.80.Fb, 32.30.Rj, 33.60.Fy
Abstract
We investigate the double K-shell ionization of heliumlike ions by a single photon. A fast convergency of QED perturbation theory with respect to parameter 1/Z is demonstrated in entire nonrelativistic domain for moderate nuclear charge numbers Z \ge 2. The ratio of double-to-single photoionization cross sections is calculated for light heliumlike ions, taking into account the leading orders of 1/Z and α Z expansions. A comparison of our results with available experimental data for a number of neutral atoms is presented.