NORMAL COORDINATES FOR VINYL FLUORIDE AND THE SEVEN DEUTEROVINYL FLUORIDES

$^{1}$ B. Bak and D. Christensen, Spectrochim, Acta 12, 355 (1958). $^{2}$ J. R. Scherer and W. J. Potts, J. Chem Phys. 31, 1691 (1959).Author Institution: Department of Chemistry, Thermodynamic Research Center Texas A\&M UniversityAnnual coordinate calculation was carried out for these eight isotopic molecules based mainly on the experimental data reported by Bak and $Christensen.^{1}$ A perturbation program was used and the most general quadratic valence force potential function was assumed. A six-constant potential function did reproduce very closely the 24 out-of-plane vibrations. The results agree very well with those of Scherer and $Potts.^{2}$ A least-squares fit of the 72 calculated to the observed in-plane frequencies was obtained using a 45-constant potential function. On the basis of these calculations, the in-plane fundamental vibrational assignments of Bak and Christensen were reexamined and modified. The new assignments as well as the final set of potential functions will be presented and discussed