Group Moment Interpretation of the Infrared Intensities of Crystalline n-Paraffins

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Abstract
The infrared intensities of bands in the spectra (3000–700 cm−1) of the crystalline n‐paraffins n‐C4H10 through n‐C8H18 have been measured and interpreted using a group moment model. In this model intensities are expressed in terms of dipole moment derivatives with respect to group coordinates, i.e., coordinates describing the motions of CH3 and CH2 groups. In spite of a severe limitation in the accuracy of the measured intensities caused by preferred orientation in the polycrystalline films, a good correlation between calculated and observed intensities has been obtained.
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