Abstract
We report on ab initio calculations of two-photon, single- anddouble-electron ejection cross sections in helium, using multichannelwavefunctions constructed within the framework of discretized basesinvolving linear combinations of B-splines. Within the lowest non-vanishingorder of perturbation theory, two-photon double ionization, for photonenergies from 42.5 to 46.5 eV, is found to be about 10% that of singleionization. It is also found that electron correlation in the final statetends to lower the amount of double ionization in comparison topredictions involving incomplete or no correlation. The potential of theapproach in the context of further open problems is alsodiscussed.
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