Abstract
We calculate collective electronic excitations and their damping in small Na n and Li n clusters. The ground state properties of these systems are described using the local density approximation, and the electronic excitations by the random phase approximation. The collective excitations in the first two closed-shell clusters with n=2, 8 atoms are discussed in detail. We find that the coupling of electronic levels to vibrational degrees of freedom accounts quantitatively for the observed width of the collective electronic excitations in alkali dimers. The origin of the analogous line broadening in Na 8 is presently unresolved.
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