Inhomogeneous broadening of Morse oscillators in liquids

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Abstract
The approximate eigenfunctions of the Morse oscillator are used to obtain by first‐order perturbation treatment the shifts of the transition frequency on intermolecular interactions. The results are shown to converge towards those obtained for the anharmonic oscillator within the limit of low anharmonicity. Subsequently, the obtained expression is used to compute the inhomogeneously broadened vibrational line shape for a number of diatomic molecules in a schematized solvent in the slow modulation limit. The agreement with experiment is fair in view of theoretical shortcomings and experimental errors.

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