Abstract

Abstract Measurements of the damping of plasma waves in two-dimensional pools of positive ions trapped below the surface of superfluid 4He have been used to obtain values of the mobility of the ions in a temperature range where the mobility is limited by ripplon scattering (10 mK to 120 mK). The mobility has been found to be inversely proportional to the temperature and to vary with the trapping depth (zo) as zo3.5, These dependences are reproduced by a theory of the mobility based on the calculated scattering of capillary waves by an isolated submerged charged sphere, but the absolute magnitude of the mobility is predicted to be a factor of about 20 too high. Some experimental evidence has been found for a weak dependence of the mobility on the areal density of ions in the pool, which suggests that the theory ought to take account of the interactions of ripplons with the collective modes of the ion pool.

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