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Theory of Multiple NMR Spin Echoes of HD Impurities in Solid Para-H2

โœ Scribed by Erika G. Kisvarsanyi; N.S. Sullivan

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
175 KB
Volume
127
Category
Article
ISSN
1090-7807

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โœฆ Synopsis

The theory of the formation of NMR multiple echoes for isotoexchange model predicts that the exchange in solid parapic impurities ( HD ) in solid para-H 2 has been developed for the H 2 would be comparable to that observed in solid 3 He case of weak quantum tunneling of the impurities. The results when the solid 3 He is compressed to a density such that show that even for low tunneling rates ( 100 -1000 Hz ) , NMR the effective free volume available for cyclic particle exmultiple echoes can be observed for experimentally accessible change is the same as that for solid H 2 . This condition nuclear spin polarizations and can be used to provide an indeoccurs at a molar volume of V m ร‡ 15 cm 3 /mol and corrependent test for the existence of tunneling in the solid hydrogens. sponds to exchange rates in the range 1 -10 kHz ( 6 ) .

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