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Semiclassical Treatment of Two-Center Electron-Electron Interactions in Energetic Atomic Collisions: Screening Effects

S. Ricz
B. Sulik
N. Stolterfoht
I. Kadar
Journal / Anthology

Physical Review A
Year: 1993
Volume: 47
Issue: 3
Page range: 1930-1938

The impact-parameter dependence of electronic screening effects is investigated within the framework of the time-dependent semiclassical perturbation theory concerning excitations. A multipole expansion is used for different screening potentials to determine time-dependent matrix elements which are suitable for first-or higher-order impact-parameter calculations. For numerical matrix elements, the present method provides a complete solution. Analytical formulas for 1s-2s and 1s-2p excitations are obtained by using hydrogenic wave functions. Our integrated cross sections are equivalent to those determined within the framework of the plane-wave Born approximation. It is shown that difficulties may arise in reproducing the present results by means of existing approximate factorization and scaling formulas.

*Science > Physics > Quantum Physics