Temperature-dependent lattice dynamics and equations of state of solid hydrogen

The experimental heat capacity of solid hydrogen as a function of molar volume

“…Unfortunately, there are no theoretical calculations which can be compared directly to the present data. Anderson et al (38) have compared their calculated heat capacity for a molar volume of 18.73 cm^/mole with the work of Ahlers (1) and have found their results to be approximately 16 percent higher than experiment. However, Figure 26 indicates that the present results are larger than the heat capacity measurements of Ahlers (1) The measurement of the constant volume heat capacity for deuterium (D^) and hydrogen deuteride (HD) would be an interesting supplement to this experiment, if the intermolecular potential is the same for the various isotopes of hydrogen, a scaling with T/®^ similar to that in hydrogen should be expected.…”