Two-phonon absorption processes in liquid octane, decane, hexadecane and nujol

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Abstract
Similarities in the measured 100–300 cm-1 absorption spectra of liquid paraffins over a wide range of chain lengths suggest that an identical absorption mechanism is dominant in each case. The intensity and temperature dependence of the 250 cm-1 band in nujol, in particular, are indicative of a multiphonon process. The present paper offers a theoretical explanation for the spectra of octane, decane, hexadecane and nujol, in terms of two-phonon absorptions. Calculations based on the Lax and Burstein approach (suitably modified to take account of finite chain length) reproduce the general features of the spectrum fairly well in each case, and provide an adequate account of the observed temperature dependence of the band in nujol.

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