Abstract

FT IR transmission spectra of large single crystals of the clathrates C 60·4C 6H 6,C 60· xCCl 4 where 0.1< x<0.2, C 60·C 2HCl 3 and C 60·1.5CS 2 are presented and discussed. Most of the weak lines are identified with activated silent or second-order combination modes of the C 60 molecule. It is shown that the number of observed modes and their relative intensities are dependent on the type of the clathrate although all the compounds are of van der Waals type.

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