Issue Eur. Phys. J. D Volume 38, Number 2, May 2006 Page(s) 249 - 255 Section Atomic Physics DOI 10.1140/epjd/e2005-00334-y Published online 20 December 2005

Eur. Phys. J. D 38, 249-255 (2006)
DOI: 10.1140/epjd/e2005-00334-y

Helium atom in the monochromatic electromagnetic field

A Hylleraas basis treatment

I.A. Ivanov and A.S. Kheifets

Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, Australia

igor.ivanov@anu.edu.au

(Received 5 September 2005 / Received in final form 15 November 2005 / Published online 20 December 2005 )

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)].

PACS
32.80.Fb - Photoionization of atoms and ions.
32.80.-t - Photon interactions with atoms.
32.80.Rm - Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states).

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2005

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