The Solid State of H2, HD and D2

By using the van der Waals field as calculated for H2 from the second virial coefficient by Lennard-Jones, and the kinetic zero point energy expression given by London in the theory of liquid He, the lattice energies of solid H2, HD and D2 have been calculated. The values calculated for the energy at 0°K are for H2 —180.4 and for D2 —280.6 calories per mole. These are in good agreement with the experimental values of —183.4 and —274.0 cal./mole, respectively. The corresponding theoretical values of the volume are 23.24 cc (22.65 obs.) for H2, and 19.78 cc (19.56 obs.) for D2. The values of HD have been predicted.