Abstract.
We apply a non-perturbative procedure for the calculation of the total photoionization cross-section of two-electron atomic systems. The procedure is based on the Floquet-Fourier representation of the time-dependent Schrödinger equation. With the use of the Hylleraas-type basis functions, the total photoionization cross-sections obtained are within the accuracy of a fraction of a percent, which, we believe, is the most accurate estimate for the cross-sections available. The total photoionization cross-sections for neutral helium deviate notably from the benchmark experimental data [J.A.R. Samson et al., J. Phys. B 27, 887 (1994)].
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Ivanov, I., Kheifets, A. Helium atom in the monochromatic electromagnetic field. Eur. Phys. J. D 38, 249–255 (2006). https://doi.org/10.1140/epjd/e2005-00334-y
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DOI: https://doi.org/10.1140/epjd/e2005-00334-y