Abstract
Coulomb explosion of a charged, nonuniform, and spherically symmetric cluster with a finite ion temperature is investigated. The spatial distributions of the density and mean velocity of accelerated ions, as well as their energy spectra, are obtained and analyzed as functions of the initial temperature. It is shown that taking into account the finite ion temperature eliminates singularities emerging during a Coulomb explosion of a spatially nonuniform cold cluster due to multistream ion motion that arises after breaking the velocity profile of the cluster ions. The characteristic temperature is found above which the spatial distribution and energy spectrum of the expanding ions become regular.
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Original Russian Text © V.N. Novikov, A.V. Brantov, V.Yu. Bychenkov, V.F. Kovalev, 2008, published in Fizika Plazmy, 2008, Vol. 34, No. 11, pp. 997–1000.