Abstract
The rotational transitionJ=1→J=0 in solid H2 was measured by incoherent neutron scattering. Results are presented for the mean energy of this transition as a function of the ortho concentration at temperatures 4.2 and 1.2 K. The data at 4.2 K are compared with theoretical calculations resolving a discrepancy between these calculations and previous experiments. At 1.2 K and high ortho concentrations, our data cannot be interpeted in terms of an orientationally orderedfcc phase as would be expected. This observation is discussed in terms of an orientationally orderedhcp phase originating perhaps from the effects of internal strains.
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Bickermann, A., Spitzer, H., Stiller, H. et al. The rotational stateJ=1 in orientationally disordered and ordered solid hydrogen. Z Physik B 31, 339–343 (1978). https://doi.org/10.1007/BF01351542
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DOI: https://doi.org/10.1007/BF01351542