The Intermolecular Force Constants of Fluorine

Abstract

The intermolecular force constants of gaseous fluorine have been determined from measurements of the second virial coefficients in the region 80–300°K. On the assumption that gas imperfection results only from binary collisions of spherical nonpolar molecules whose potential is of the form given by Eq. (1), the force constants obtained were r₀=3.61±0.04A and ε₀/k=121±3°K. These force constants yield viscosities in good agreement with the experimental data of Kanda if the high temperature point is discarded.