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The wave functions in momentum space for discrete states of hydrogen-like atoms are discussed in terms of both the early contributions to the subject and their present usefulness in atomic physics. The derivation of some of their important properties is outlined, in particular the expectation of various powers of momentum and kinetic energy, and the kinetic energy distribution. As an application, the cross-section for ionisation of hydrogen in the metastable 2S state by electron impact is calculated with the aid of the binary-encounter approximation, which requires the use of momentum-space wave functions.

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Authors: HEY J D, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Article: American Journal of Physics, Vol. 61 (1993) No. 1, pp. 28-35
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