Quantum Evaporation from Superfluid Helium at Normal Incidence

Details Quantum Evaporation from Superfluid Helium at Normal Incidence Quantum Evaporation from Superfluid Helium at Normal Incidence

1996-12-04

arxiv.org/abs/cond-mat/9612042v1

J. Phys.: Condens. Matter 9 (1997) L369

Physics

Condensed Matter

12 pages, REVTeX, 2 postscript figures, available also at http://anubis.science.unitn.it/~dalfovo/papers/papers.html

Scientific paper

10.1088/0953-8984/9/24/004

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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