Abstract
The combination of B‐spline basis sets with R‐matrix theory has provided a powerful tool for the description of double ionization processes. We demonstrate this first by investigating electron‐impact ionization of Li2+. By applying the Floquet Ansatz, the same techniques can be employed to describe multiphoton double ionization processes through the R‐matrix Floquet approach. Results for two‐photon double ionization of He confirm the lower values of time‐dependent close‐coupling calculations compared to perturbation theory. The approach can be extended to quasi‐two‐electron systems through the use of model potentials. This is demonstrated by calculating photoionization cross sections near threshold for the m = 0 level of the 4s4p 1Po state of calcium.
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