Absolute integral cross sections for elastic collisions of neutral sodium clusters Naₙ (n=2--20) with sodium atoms have been measured and the van der Waals interaction constants determined. The center-of-mass cross sections are very large (up to thousands of square angstroms), reflecting high cluster polarizabilities. It is found that the dispersion theory based on measured response parameters of alkali-metal clusters tends to overestimate the interaction strength.
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Kresin et al. (1994) studied this question.
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