The vapour phase Raman spectra, Raman band contour analyses, Coriolis coupling constants, and force constants for the molecules F12CH3, F13CH3, H12CCl3 and H13CCl3

The vapour phase Raman spectra of the molecules F12CH3, F13CH3, H12CCl3, and H13CCl3 have been recorded at pressures of ca. 1 atmosphere over the fundamental frequency regions. Partly resolved rotational structure is reported for some fundamentals of methyl fluoride. The Raman band contours of the e-species fundamentals have been analysed to yield Coriolis constants from which e-species force constants have been calculated. The Coriolis and force constants so determined are compared with those based on analyses of appropriate vapour phase infra-red spectra.