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Microscopic calculation of the van der Waals interaction between small metal clusters

Authors: J. Pacheco and W. Ekardt

Ref.: Physical Review Letters 68, 3694-3697 (1992)

Abstract: The nonretarded van der Waals coefficients C6 and C8 are determined for all pairs of neutral sodium microclusters with 1,2,8,20, and 40 atoms. These small systems are described self-consistently weithin the jellium model and their multipole dynamical polarizabilities calculated making use of the time dependent local density approximation. It is found that quantum size effects, in particular Landau fragmentation, play a crucial role in the determination of the coefficients. Furthermore, it is found that the coefficients are very insensitive to the internal temperature of the clusters, in the range of temperatures reachable experimentally. A discussion on the accuracy of the predicted values is given.