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Quantum Evaporation from Superfluid Helium at Normal Incidence

F. Dalfovo·M. Guilleumas·A. Lastri·L. Pitaevskii·S. Stringari
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Abstract

We study the scattering of atoms, rotons and phonons at the free surface of $^4$He at normal incidence and calculate the evaporation, condensation and reflection probabilities. Assuming elastic one-to-one processes and using general properties of the scattering matrix, such as unitarity and time reversal, we argue that all nonzero probabilities can be written in terms of a single energy-dependent parameter. Quantitative predictions are obtained using linearized time dependent density functional theory.

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F. Dalfovo, M. Guilleumas, A. Lastri, L. Pitaevskii, S. Stringari. 1996-12-04. Quantum Evaporation from Superfluid Helium at Normal Incidence. https://doi.org/10.1088/0953-8984%2F9%2F24%2F004

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