NUCLEAR MAGNETIC RESONANCE IN SOLID H2 AND D2 UNDER HIGH PRESSURES.
Technical rept. no. 3.
DUKE UNIV DURHAM N C
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Nuclear magnetic resonance data are presented for solid H2 and D2 between 1.5 and 4.2K and at pressures up to 5500 atm. For solid hydrogen, the ortho-para conversion, the transition temperature from the state of free rotation to that of hindered rotation and the line-width and second moment above the transition temp. was measured as a function of density and ortho concentration. The results are compared with other experimental evidence and with theoretical expectations. The second moment for both H2 and D2 the latter with an ortho concentration of 0.67 is compared to that calculated for dipole-dipole interaction in a rigid lattice having the structure and dimension determined from x-ray and neutron data. The experimental second moments are found to be larger than the calculated ones and the discrepancy is discussed. Author