Low Temperature Physics: 38, 1005 (2012); https://doi.org/10.1063/1.4766586 (8 pages)
Fizika Nizkikh Temperatur: Volume 38, Number 11 (November 2012), p. 1274-1283    ( to contents , go back )

Estimate of surfon evaporation time from the liquid helium surface due to the scattering on ripplons

A.D. Grigoriev1, P.D. Grigoriev2, A.M. Dyugaev2, and A.F. Krutov1

1Samara State University, Ak. Pavlova st., 1, Samara, 443011, Russia

2Landau Institute for Theoretical Physics, Akademika Semenova av., 1-A , Chernogolovka, 142432, Russia
E-mail: grigorev@itp.ac.ru
pos Анотація:

Received June 13, 2012, revised June 21, 2012

Abstract

Recently a new type of surface excitations, surfons, was proposed. Phenomenologically, these excitations can be interpreted as atoms on a surface quantum level. They explain the strong temperature dependence of surface tension coefficient of liquid helium. In the present work we study theoretically the interaction of these excitations with ripplons, the quanta of surface waves. We estimate the lifetime of surfons due to the absorption of a ripplon and the subsequent evaporation from the surface. The obtained surfon lifetime considerably exceeds the inverse surfon energy, substantiating the treatment of surfons as quasiparticles.

PACS: 68.03.–g Gas–liquid and vacuum–liquid interfaces;
PACS: 68.03.Fg Evaporation and condensation ofliquids;
PACS: 68.03.Hj Liquid surface structure: measurements and simulations;
PACS: 68.03.Kn Dynamics (capillary waves);
PACS: 67.10.–j Quantum fluids: general properties.

Key words: liquid helium, surface excitations, surfons, ripplons.

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