Structure and Stability of Multielectron Bubbles in Liquid Helium

Abstract
The charge-density distribution in multielectron bubbles is calculated with use of a generalized Thomas-Fermi method. The exchange and correlation effects are found crucial; these result in a density profile much narrower than that obtained by simple estimates. The observed stability of the bubbles is explained in terms of the nonlinear coupling between the radial and angular modes of oscillation. Above a threshold oscillation amplitude a period-doubling instability sets in.

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