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- W67390808 abstract "Energy losses of charged particles in gases are mainly determined by impact ionization. At low energies, below the range of validity of the First Born Approximation (FBA), our theoretical understanding of impact ionization is not yet satisfactory. With data on impact ionization by posi-trons (as well as antiprotons) becoming available we can now compare particles of equal mass and different charge and vice versa. The study of positron-impact ionization will contribute significantly to the theory of electron-impact ionization; the absence of the exchange interaction with the atomic electrons makes positron-impact ionization a much simpler process theoretically. The Wannier theory of threshold behaviour, which has proven to be compatible with all electron tests performed so far, will be put to yet another test with positrons for which a different power-law exponent has been predicted. Positronium (Ps) formation on atoms is a unique quantum mechanical rearrangement problem; of interest here is a comparison with electron transfer in proton-atom collisions.KeywordsTotal Cross SectionExcitation Cross SectionElastic Cross SectionFinal VelocityPositronium FormationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
- W67390808 created "2016-06-24" @default.
- W67390808 creator A5029411393 @default.
- W67390808 date "1987-01-01" @default.
- W67390808 modified "2023-09-26" @default.
- W67390808 title "Positron-Impact Ionization and Positronium Formation" @default.
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- W67390808 doi "https://doi.org/10.1007/978-1-4613-0963-5_1" @default.
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