Fourth Moment Correction to the Spectral Density Responsible for the Longitudinal Nuclear Relaxation in Solid H2
Open Access
- 1 August 1970
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics
- Vol. 44 (2) , 303-327
- https://doi.org/10.1143/ptp.44.303
Abstract
The spectral density responsible for the longitudinal nuclear relaxation time, T1, in solid H2 is studied at the high temperature limit of the rigid lattice, by taking the fourth moment into account. The relevant moments are evaluated simply by a systematic procedure based on the algebra of tensors, assuming the orientation dependent energy to be exclusively the electric quadrupole-quadrupole interaction. At high o-H2 concentration, the high temperature limit of T1 predicted by the present study is shorter than that by Gaussian approximation by about 10%, in agreement with the recent measurement by Amstutz et al., if one chooses the coupling constant of the quadrupole-quadrupole interaction to be consistent with other kinds of measurements.Keywords
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