Tables of second virial and low-pressure Joule-Thomson coefficients for intermolecular potentials with exponential repulsion

Abstract

The potentials used are functions of r , the distance between the centres of the molecules, but not of their relative orientation. The long-range attraction between the molecules is taken to be the sum of terms proportional to r -6 and r ~8 , and the short-range repulsion is proportional to e ~pr . This potential has four parameters: the position and depth of the minimum of the potential, the relative importance of the r -8 term, and the steepness of the exponential repulsion. The second virial and low-pressure Joule-Thomson coefficients are tabulated for the range of parameters likely to be found in actual molecules, and for temperatures from the critical temperature to about 20 times this value. The most important of the three quantum corrections is tabulated over the same ranges.