Ionization of hydrogen by positron impact near the fragmentation threshold
- 1 June 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 49 (6) , R4289-R4292
- https://doi.org/10.1103/physreva.49.r4289
Abstract
The semiclassical approximation of Feynman’s path integral is used to calculate the S matrix for the positron-impact ionization of hydrogen. The formulation provides a full scattering amplitude, and more importantly does not require knowledge of the asymptotic three-body Coulomb state in the continuum. In the limit of vanishing excess energy, the results confirm Wannier’s classical model for fragmentation [Phys. Rev. 90, 817 (1953)]. The experimentally observable ratio of fragmentation versus total ionization (including positronium formation) is predicted.Keywords
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