Abstract
Electron-correlation and spin-orbit-interaction effects are known to play an important role in the quantitative description of multiphoton ionization of heavy atoms. In this paper an ab initio approach to two-photon ionization (2PI) of closed-shell atoms in the framework of the relativistic time-dependent Dirac-Fock theory is proposed. This formulation is known to contain important electron-correlation corrections and includes the spin-orbit interaction by use of relativistic wave functions. Computational results for nonresonant 2PI total cross sections of the rare gases are given. The approach is suitable for calculations of angular distributions, branching ratios, and autoionizing resonances.
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