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Charged-particle interaction with liquids: Ripplon excitations
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We calculate the ripplon field contribution to the self-energy of an electron exterior to a liquid for planar and spherical geometries. We compare the full dielectric calculation of the electron-liquid interaction with the simpler alternative method consisting of integrating the electron-atom static-induced-dipolar potential through the whole liquid volume. We obtain good agreement between both methods for a nonpolar liquid such as 4He but differences up to 40% for a polar liquid such as water. We study the conditions under which the ripplon contribution to the self-energy is a perturbation. For an electron moving parallel to a planar liquid surface, we calculate the ripplon contribution to its stopping power. For this dynamical case, we conclude that the alternative method is a good approximation even for polar liquids.
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BARBERÁN FALCÓN, Núria, GARCIA MOLINA, Rafael, GRAS MARTÍ, Alberto. Charged-particle interaction with liquids: Ripplon excitations. _Physical Review B_. 1989. Vol. 40, núm. 1, pàgs. 10-19. [consulta: 21 de gener de 2026]. ISSN: 0163-1829. [Disponible a: https://hdl.handle.net/2445/9762]