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
Received June 13, 2012, revised June 21, 2012
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.