Pressure dependence of the rotational ground state tunnel splitting in Ni(NH3)6I2

J. Eckert, R. Youngblood

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Inelastic neutron scattering techniques have been used to determine the rotational tunnel splitting of the librational ground state of ammonia molecules in Ni(NH3)6I2 as a function of hydrostatic pressure up to 5.6 kbar at 8 K. The resulting exponential dependence of the tunnel splitting on pressure was interpreted with the help of a concurrent measurement of the compressibility to suggest a dependence on the interatomic distance as r-9 of the orientational potential. The phase transition temperature at 5.6 kbar was determined to be 27 K compared with 19.9 K at atmospheric pressure.

Original languageEnglish
Pages (from-to)1393-1396
Number of pages4
JournalSolid State Communications
Issue number9
StatePublished - Dec 1982


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