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Microscopic structure of the plasma resonance in charged potassium microcluster

Authors: C. Yannouleas, J. Pacheco and R. Broglia

Ref.: Physical Review B 41, 6088-6091 (1991)

Abstract: The dipole function of K9+, K21+, and K22 2+ charged microclusters is calculated within the framework of the random-phase approximation. Contrary to the case of neutral clusters, essentially no Landau damping is found in the system under study here, the spectrum being dominated by a single peak carrying most of the oscillator strength. The coupling of the plasmon to thermal fluctuations of the surface can account for about 60% of the observed spreading width.