Time-dependent R-matrix theory applied to two-photon double ionization of He

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We introduce a time-dependent R-matrix theory generalized to describe double-ionization processes. The method is used to investigate two-photon double ionization of He by intense XUV laser radiation. We combine a detailed B-spline-based wave-function description in an extended inner region with a single-electron outer region containing channels representing both single ionization and double ionization. A comparison of wave-function densities for different box sizes demonstrates that the flow between the two regions is described with excellent accuracy. The obtained two-photon double-ionization cross sections are in excellent agreement with other cross sections available. Compared to calculations fully contained within a finite inner region, the present calculations can be propagated over the time it takes the slowest electron to reach the boundary.
Original languageEnglish
Article number053407
Number of pages6
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Issue number5
Publication statusPublished - 07 May 2014


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