Infra-red spectra and state of aggregation. II

Abstract
In continuation of earlier work on the correlation of infra-red absorption spectra of matter in different states of aggregation, the vibrational spectra of a number of substances have been measured in the solid and liquid states. These included paraffins, aromatic hydrocarbons and their simple derivations. The alterations in spectrum which occur on melting are complex, and few generalizations can be made. Attempts have been made to consider them in terms of the assignment of vibration bands to certain atomic groupings, but it seems probable that before the results can be satisfactorily understood it will be necessary to know more about the internal structure of the solid substances.