Abstract
We introduce a timedependent Rmatrix theory generalized to describe doubleionization processes. The method is used to investigate twophoton double ionization of He by intense XUV laser radiation. We combine a detailed Bsplinebased wavefunction description in an extended inner region with a singleelectron outer region containing channels representing both single ionization and double ionization. A comparison of wavefunction densities for different box sizes demonstrates that the flow between the two regions is described with excellent accuracy. The obtained twophoton doubleionization 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 
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Hugo Van Der Hart
Person: Academic