Nonrelativistic double photoeffect on lithiumlike ions at high energies

Details Nonrelativistic double photoeffect on lithiumlike ions at high energies Nonrelativistic double photoeffect on lithiumlike ions at high energies

2006-05-22

arxiv.org/abs/physics/0605184v1

Physics

Atomic Physics

12 pages, 2 figures. to be published in Physics Letters A

Scientific paper

10.1016/j.physleta.2006.02.055

The total cross section for double ionization of lithiumlike ions by a high-energy photon is calculated in leading order of the nonrelativistic perturbation theory. The partial contributions due to simultaneous and sequential emissions of two electrons are taken into account. The cross section under consideration is shown to be related to those for double photoeffect on the ground and excited 2^{1,3}S states of heliumlike ions. The double-to-single ionization ratio is equal to R = 0.288/Z^2 for lithiumlike ions with moderate nuclear charge numbers Z. However, even for the lightest three-electron targets such as Li and Be^+, analytical predictions are found to be in good agreement with the numerical calculations performed within the framework of different rather involved approaches.

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