The Raman Spectrum of Vinylidene Fluoride

摘要

The Raman spectrum of vinylidene fluoride has been obtained in the liquid state at minus;100 to minus;125deg;C. The observed frequencies were assigned to the fundamental modes of vibration (and several combinations of these) with the aid of the infrahyphen;red data in the literature supplemented by some measurements in our laboratory. A normal coordinate treatment of the vibrations has been carried out using asimplevalency force field plus one additional term depending upon the square of the change in the Fsngbnd;F distance. It is shown that the repulsion between the F atoms and between each F atom and the pgr;hyphen;electrons of the double bond are of major importance.