Physics – Atomic Physics
Scientific paper
2009-01-16
Physics
Atomic Physics
13 pages, 4 figures
Scientific paper
We present an {\it ab initio} and non-perturbative time-dependent approach to the problem of double ionization of a general atom driven by intense XUV laser pulses. After using a highly flexible $B$-Spline $R$-matrix method to generate field-free Hamiltonian and electric dipole matrices, the initial state is propagated in time using an efficient Arnoldi-Lanczos scheme. Test calculations for double ionization of He by a single laser pulse yield good agreement with benchmark results obtained with other methods. The method is then applied to two-color pump-probe processes, for which momentum and energy distributions of the two outgoing electrons are presented.
Bartschat Klaus
Guan Xiaoxu
Noble John C.
Schneider Barry I.
Zatsarinny Oleg
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