Intensities of binary overtone and combination bands in the ir spectrum of CClF3

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The intensities of the fundamental, binary overtone and binary combination bands in the ir spectrum of CClF3 have been measured. The intensities of the fundamentals have been interpreted in terms of a polar-tensor model; those of the overtone and combination bands have been interpreted in terms of a model which ascribes all the intensity to mechanical anharmonicity and none to higher terms in the dipole–moment expansion in normal coordinates. It appears, from the success of this model, that the contributions from the second derivatives of the dipole moment to the binary overtone and combination bands are relatively unimportant in this molecule.