On rotation of CH3F isolated in rare gas matrices

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Abstract
We report herein some new infrared spectral observations on the CF stretching mode of CH3F isolated in krypton matrices. It is shown that extensive annealing removes the asymmetry which had been tentatively assigned to an envelope of rotational structure. Our results can be explained with a two‐site model and without invoking free or hindered rotation, except in the limit of libration. (AIP)