Direct double L-shell ionization of a Be-like ion by a high-energy photon

Mikhailov, A. I.; Nefiodov, A. V.; Plunien, G.

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Direct double L-shell ionization of a Be-like ion by a high-energy photon

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Mikhailov, A. I.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Nefiodov, A. V.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Mikhailov, A. I., Nefiodov, A. V., & Plunien, G. (2011). Direct double L-shell ionization of a Be-like ion by a high-energy photon. Journal of Physics B-Atomic Molecular and Optical Physics, 44(13): 135202.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-8C77-B

Abstract

We have evaluated the cross sections for the double L-shell ionization of a Be-like ion by a single high-energy photon. The evaluation is performed within the framework of non-relativistic perturbation theory with respect to the interelectron interaction. The correct linear combination of the 2s(2)- and 2p(2)-configurations is used as zeroth approximation for the wavefunction of the initial state. The interelectron interaction is taken into account between the valence electrons, while the electrons of the inner K-shell are considered as spectators. The scaling formula is obtained for the ratio of double-to-single ionization cross sections. As a by-product of our approach, we have also derived the analytical expression for the Auger width of the lowest doubly excited state of a He-like multicharged ion.