Abstract
The crystal field which surrounds a polyatomic ion in a crystal lattice acts as a perturbation on the vibrational levels and influences them to a large extent. It depends upon the symmetry of the surrounding field whether degenerate vibrational levels may be split and whether infra-red inactive vibrations may become active. The influence of the (face-centred) cubic-crystal field on the vibrations of the borohydride ion, imbedded in the lattice of the alkali-halides, is discussed. The local symmetry group of the BH4− ion is found to be Td in the solid solutions studied.
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