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Infrared band contours have been observed for nonpolar molecules in the liquid phase and in solution in nonpolar solvents with a spectral slitwidth of about 1 cm—1. A criterion was established for measuring the relative amounts of Lorentzian and Gaussian character to a band. It was found that symmetric bands were Lorentzian and that asymmetry appeared as a consequence of intramolecular effects that could be shown to be present in the vapor-phase spectrum.
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Abramowitz et al. (1963) studied this question.
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