Studies of the nuclear spin echoes and spin-spin relaxation times T₂ of hydrogen constrained to the interior of the molecular cages of zeolite have shown that liquid hydrogen can be supercooled well below the limits previously reported. The T₂ values peak sharply at the liquid-solid transition temperatures which have a strong, hitherto unobserved orthohydrogen-concentration and sample dependence. A similar behavior in T₂ has been observed for an HD sample which has no orientational degrees of freedom.
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Rall et al. (1991) studied this question.
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