Bond Force Constants and Vibrational Frequencies of Some Hydrocarbons

Abstract
By use of valence forces, the normal coordinate method of treating vibrations has been applied to a number of related molecules and twenty‐nine frequencies have been calculated and compared with experiment. The molecules considered are methylacetylene, dimethylacetylene, acetylene, diacetylene, ethane and methane. The frequencies calculated include all of the nondegenerate frequencies for the above molecules and the degenerate frequencies of methane. A set of five force constants has been applied to all of the molecules with fairly good results. The calculations have been carried out for both liquids and gases, a slightly different set of force constants being assigned to each state of aggregation.

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