Abstract
The temperature dependences of the longitudinal acoustic mode (LAM) frequency and the splitting of the methylene rocking mode accompanied with the A-B-C solidsolid phase transitions of higher n-alkanes, C_ , C_ , C_ , C_ and C_ , were measured by Raman and infrared spectra. The LAM frequency became constant in the B phase after a gradual decrease with the increase of temperature and fell in a lower constant value near the B-C transition temperature. The temperature dependence of the splitting of the methylene rocking mode was essentially the same with that of the distance between the nearest neighbor chains in a sub-cell. The character of the phase transitions ofn-alkanes was discussed.
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