Calculations of total photoionization cross-section for^M two-electron atomic systems

Details Calculations of total photoionization cross-section for^M two-electron atomic systems Calculations of total photoionization cross-section for^M two-electron atomic systems

2005-02-04

arxiv.org/abs/physics/0502018v1

Physics

Atomic Physics

16 pages, 1 figure

Scientific paper

We outline a non-perturbative procedure for calculating the total photoionization cross-section of two-electron atomic systems. The procedure is based on the Floquet-Fourie representation of the solution of the time-dependent Schrodinger equation. The Floquet-Fourie ansatz produces a set of equations which is recast into a generalized eigenvalue problem by means of the complex rotation procedure. With the use of the Hylleraas-type basis functions, the total photoionization cross-sections are obtained within the accuracy of a fraction of a percent. The total photoionization cross-sections for neutral helium are in good agreement with the convergent close-coupling calculations of Kheifets and Bray [Phys. Rev. A {\bf 58}, 4501 (1999)] but deviate notably from the experimental data of Samson {\em et al.} [J. Phys. B {\bf 27} 887 (1994)].

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