Abstract
Using NMR techniques on two single crystals of H2, we have determined the crystalline field V c that splits the rotational ground state of isolated ortho-H2 molecules in para-H2. From the temperature-dependent splitting of the NMR doublet peak, we obtain an average % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4baFfea0dXde9vqpa0lb9% cq0dXdb9IqFHe9FjuP0-iq0dXdbba9pe0lb9hs0dXda91qaq-xfr-x% fj-hmeGabaqaciGacaGaaeqabaWaaeaaeaaakeaacaGG8bacbaGab8% NvayaaraWaaSbaaSqaaiaa-ngaaeqaaOGaaiiFaiaac+cacaWFRbWa% aSbaaSqaaiaa-jeaaeqaaOGaeyypa0JaaGimaiaac6cacaaIWaGaaG% imaiaaiIdacaaIZaGaeyySaeRaaGimaiaac6cacaaIWaGaaGimaiaa% ikdacaqGGaGaa83saaaa!4563!\[|\bar V_c |/k_B = 0.0083 \pm 0.002{\rm{ }}K\] independent of ortho concentration X over the range between x= 0.1% and 1.5%. The experimental spectra, as a function of both T and the applied field orientation, can be fitted by a model where V c has a Gaussian distribution about its average value with a standard deviation V c289-03. This distribution might be caused by strains in the sample. The values of δV c are compared with those from previous experiments.
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Research supported by a grant from the National Science Foundation.
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Schweizer, R., Washburn, S. & Meyer, H. NMR studies on single crystals of H2: I. The crystalline field energy for ortho-H2 impurities in solid para-H2 . J Low Temp Phys 37, 289–308 (1979). https://doi.org/10.1007/BF00119191
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DOI: https://doi.org/10.1007/BF00119191