Deep-Hole Excitations in Solids. I. Fast-Electron-Plasmon Effects
- 1 May 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 5 (9), 3512-3522
- https://doi.org/10.1103/physrevb.5.3512
Abstract
The theory of plasmon satellites in experiments where ion cores are excited is developed in a manner which complements the work of one of the authors, which showed how the interaction of slow electrons with plasmons could be treated to all orders in perturbation theory in a certain approximation. Here the fast-electron-plasmon coupling is treated by perturbation theory. The details of the calculation of the fast-electron admittance function mentioned earlier are given, and, in addition, the interference terms or vertex corrections between fast and slow electrons are treated by lowest-order perturbation theory. As prototypes, the theories of appearance-potential spectroscopy and electron energy loss with core excitation are considered. For the latter, because of "slow-charge" conservation, all plasmon effects, including these interference terms, associated with the core excitation are negligible. However, appearance-potential spectroscopy, because of nonconservation of "slow charge," has plasmon satellites associated with the core excitation which are reduced in strength by a fractional amount of the order of , owing to these fast-slow interference terms.
Keywords
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