Abstract
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 language | English |
|---|---|
| Article number | 053407 |
| Number of pages | 6 |
| Journal | Physical Review A (Atomic, Molecular, and Optical Physics) |
| Volume | 89 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 07 May 2014 |
