Nuclear Magnetic Resonance in Solidandunder High Pressure
- 17 May 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 138 (4A), A1293-A1302
- https://doi.org/10.1103/physrev.138.a1293
Abstract
Nuclear magnetic resonance data are presented for solid and between 1.5 and 4.2°K 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 a more ordered state, and the linewidth and second moment above have been measured as a function of density and ortho concentration. The ortho-para conversion rate is approximately proportional to and the transition temperature for a given ortho concentration is roughly proportional to . These results are compared with other experimental evidence and with theoretical expectations. The second moment for both and (the latter with an ortho concentration of 0.67) is compared to that calculated for the dipole-dipole interaction in a rigid lattice having the structure and dimensions 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.
Keywords
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