Thermodynamics and vibrational dynamics of tetrachloromethane, benzene, and cyclohexane

From Brillouin spectra of tetrachloromethane, benzene and cyclohexane measured between 283.15 K and 343.15 K, and carefully re-evaluated data for the heat capacities at constant pressure C_P, and constant volume C_V, the vibrational contribution to C_V was determined and compared with calculated values obtained from the Planck-Einstein relation. Utilizing perfect gas state heat capacity data, the residual heat capacity C_V^* wa determined and subsequently used to present an estimate for the residual rotational heat capacity (external rotation).