Abstract
The properties of ion clusters in superfluid helium are usually treated within the model proposed by Atkins (the snowball model). However, although a solid sphere of radius Ra around the seed ion can actually exist, it is vitally important to which extent it really governs the scattering mechanisms of various thermal excitations at the cluster. Detailed analysis of available data on the phonon as well as the impurity and Stokes mobilities reveals that the true unifying factor in the discussed picture is a power-law density enhancement in the vicinity of the seed charged particle caused by the polarization forces rather than the radius Ra
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