WHAT CAUSES THE OBSERVED DIFFERENCES BETWEEN SOLID H2 AND D2

Although solid H-2 and D2 have many similarities, such as the orientational ordering through intermolecular electrostatic interaction, they also show striking differences. Basic differences in behavior resulting from those in the masses and in the nuclear magnetic moments will be discussed. The contrasting dynamic behavior of both solids during the martensitic transformation driven by the orientational order-disorder transition is described. A possible scenario that might shed some light on this difference in behavior is presented.