Rotational relaxation of symmetric tops CH3D and CD3H in some inert liquids

Infra-red spectra of CH3D and CD3H dissolved in liquid Ar, Kr, Xe, N2, O2 and CH4 or CF4 have been recorded. From the band shapes, rotational correlation functions, band moments and intermolecular mean square torques have been calculated. To describe the tumbling motion, involved in the parallel band profiles, we have computed the theoretical correlation functions in the m or j diffusion limits. The validity of these Gordon models is discussed. In an attempt to obtain some information on the rotational diffusion tensor, experimental correlation times have been estimated from A1 and E bands of CD3H.