Rotons and Quantum Evaporation from Superfluid 4He

Details Rotons and Quantum Evaporation from Superfluid 4He Rotons and Quantum Evaporation from Superfluid 4He

1995-05-25

arxiv.org/abs/cond-mat/9505121v1

Physics

Condensed Matter

11 pages, REVTEX, 3 figures available upon request or at http://anubis.science.unitn.it/~dalfovo/papers/papers.html

Scientific paper

10.1103/PhysRevLett.75.2510

The probability of evaporation induced by $R^+$ and $R^-$ rotons at the surface of superfluid helium is calculated using time dependent density functional theory. We consider excitation energies and incident angles such that phonons do not take part in the scattering process. We predict sizable evaporation rates, which originate entirely from quantum effects. Results for the atomic reflectivity and for the probability of the roton change-mode reflection are also presented.

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