The coupling between ripplons and the motion of ion pools trapped beneath the surface of 4He

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It is well known that the motion of positive or negative ions close to the surface of superfluid He-4 can excite ripplons in the helium surface. We consider a simple toy model in which a lattice of point charges couples to the 4He surface via electrostatic forces. We calculate the coupled mode spectrum of this system and present detailed information on the mode splitting which occurs when the ripplons and the normal modes of the ion pool are degenerate. Such energy gaps should, we believe, be experimentally observable.


Original languageEnglish
Pages (from-to)315-316
Number of pages2
JournalCzechoslovak Journal of Physics
Issue numberS1
Publication statusPublished - 1 Jan 1996