Vapour-phase Raman spectra of Group IVB tetrahalides

Abstract
The vapour-phase Raman spectra of 12 tetrahalides of Group IVB have been recorded and values for the Q-branches of each fundamental are tabulated; the separation of the OP and RS branch maxima of the ν2(e) mode in each case agrees well with that calculated on the basis of the Placzek–Teller theory.