POTENTIAL ENERGY CONSTANTS, ROTATIONAL DISTORTION CONSTANTS AND THERMODYNAMIC PROPERTIES FOR SOME PLANAR $XYZ_{2}$ MOLECULES

Author Institution: Department of Physics, Illiois Institute of Technology“A normal coordinate treatment has been carried out for the molecules $COC1_{2}, COF_{2}, CSC1_{2} COH_{2}$ and $COD_{2}$ using the most general quadratic potential energy function. The potential energy constants obtained were then used to determine the rotational distortion constants, based on the first-order perturbation theory of Kivelson and Wilson. The molar thermodynamic properties--heat content, free energy, entropy, and heat capacity--also were calculated for 12 temperatures from 100 to $1000^\circ K$ for the ideal gaseous state at one atmospheric pressure and with the usual rigid-rotor harmonic-oscillator approximation.