NMR spin-echo responses in the ordered cubic phase of solid deuterium
NMR spin echoes stimulated in the ordered cubic phase of solid D/sub 2/ by 90/sup 0/-tau-90/sup 0//sub 90degree/ pulse sequences using nonrigid rotating 90/sup 0/ rf pulses are shown to be in quantitative agreement with the theoretical line shapes predicted from the intramolecular dipolar interaction between I = 1 nuclei on a rigid lattice when spectral attenuation of the 90/sup 0/ rf pulse power profile is properly taken into account. A single-particle theoretical model for the I = 1 component of cubic-D/sub 2/ solid echo, which neglects effects due to intermolecular dipolar interactions, is developed for the general case where nonrigid rotation of the I = 1 spin system is produced by both pulses in the echo creation sequence. The characteristic features of this model are demonstrated for the case of the solid-echo profile of 80% para-D/sub 2/ at 0.94 K, with the predicted attenuation of the signal-amplitude maximum at 2tau agreeing with the observed decrease within the precision measure of the experiment. In addition, the Fourier transform of the experimental echo profile of 80% para-D/sub 2/ at 1.4 K is found to be in good agreement with the published cw spectrum of Maraviglia et al.
- Research Organization:
- Department of Chemistry and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
- OSTI ID:
- 6426739
- Journal Information:
- Phys. Rev., B: Solid State; (United States), Vol. 18:11
- Country of Publication:
- United States
- Language:
- English
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