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NMR studies on single crystals of H2: I. The crystalline field energy for ortho-H2impurities in solid para-H2

✍ Scribed by R. Schweizer; S. Washburn; H. Meyer

Publisher: Springer US
Year: 1979
Tongue: English
Weight: 788 KB
Volume: 37
Category: Article
ISSN: 0022-2291
DOI: 10.1007/bf00119191

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✦ Synopsis

Using NMR techniques on two single crystals of H2, we have determined the crystalline field Vc that splits the rotational ground state of isolated ortho-H2 molecules in para-He. From the temperature-dependent splitting of the NMR doublet peak, we obtain an average Ivcl/kB = 0.0083 + 0.002 K independent of ortho concentration X over the range between X = O. 1% and 1.5%. The experimental spectra, as a [unction of both T and the applied field orientation, can be fitted by a model where Vc has a Gaussian distribution about its average value with a standard deviation 6Vc = O.O04 K. This distribution might be caused by strains in the sample. The values of fgc are compared with those from previous experiments.

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