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. 1993 Jan-Feb;98(1):89–108. doi: 10.6028/jres.098.007

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 23 — (a) Inelastic neutron scattering spectra of the transition from the ground state to the first excited state as a function of pressure, (b) Energy of the transition from the ground state to the first torsional level as function of pressure [49].