Abstract

A theoretical treatment of ionization in atomic collisions is developed for quantum-mechanical and semiclassical relative motions. It is based on a molecular-wave-function expansion containing both discrete and continuum spectrum states. The continuum is discretized by further expansion, which leads to normalizable ''electronic state packets.'' A procedure is described to calculate scattering amplitudes that avoids having to orthogonalize continuum states to all the (usually unknown) discrete ones.

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