Abstract
A method is proposed for the quantitative description of excitations in clusters. The Hartree-Fock approximation is used as the basic approximation. It is demonstrated that, in principle, long-lived excitations can exist in beryllium. A condensate of excited states is revealed in beryllium clusters with interatomic distances on the order of eleven Bohr radii.
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Original Russian Text © A.V. Popov, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 8, pp. 1530–1534.