https://doi.org/10.1140/epjd/e2005-00334-y
Helium atom in the monochromatic electromagnetic field
A Hylleraas basis treatment
Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 0200, Australia
Corresponding author: a igor.ivanov@anu.edu.au
Received:
5
September
2005
Revised:
15
November
2005
Published online:
20
December
2005
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, 2006
