Abstract
We report a systematic study of the longitudinal relaxation timeT 1 for solid H2 samples with ortho concentrationX between 0.15 and 0.70 and for 0.1≲T≲2 K. It is over this temperature region that substantial orientational ordering takes place, which drastically affectsT 1. The measurements were made using the solid echo technique at 9 and 27 MHz. By Fourier-transforming the echo decay, it was possible to investigate the recovery from saturation of the various parts of the NMR absorption line as a function of their distance ν−ν L from the center at the Larmor frequency ν L .The dependence ofT 1 on ν−ν L is particularly noticeable in the hcp disordered (para-orientational) phase at the lowest temperatures, where the NMR absorption is broad, and this observation is qualitatively explained. An attempt is made to understand the general features ofT 1 in the cubic ordered phase and in the hcp para-orientational phase in terms of certain relaxation mechanisms. A comparison with previous work is presented.
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Work supported by NSF grant DMR-81-02993.
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Washburn, S., Calkins, M., Meyer, H. et al. Pulsed NMR studies in solid H2. III. Spin-lattice relaxation times. J Low Temp Phys 53, 585–617 (1983). https://doi.org/10.1007/BF00683996
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DOI: https://doi.org/10.1007/BF00683996