Abstract
We report new pulsed NMR studies of the supercooling of molecular hydrogen constrained to the interior of the molecular cages of zeolite. Measurements of the supercooling for the ultra-small structure of zeolite-5A in comparison with earlier studies show that the substantial supercooling observed does not depend strongly on the characteristic dimensions and is interpreted as a class-II growth attributed to imperfect wetting. Studies of the supercooling of HD and detailed analyses of the orientational ordering of molecular H2 show that the abrupt transitions observed in the pulsed NMR studies are associated with the supercooled liquid/solid transitions and are not associated with orientational ordering.
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Sullivan, N.S., Rall, M. & Brison, J.P. NMR studies of molecular hydrogen in zeolite. J Low Temp Phys 98, 383–401 (1995). https://doi.org/10.1007/BF00752275
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DOI: https://doi.org/10.1007/BF00752275