The pressure dependence of rotational states in (NH4)2 PdCl6

The pressure dependence of the ground-state tunnel splitting and the energy of transition to the first excited librational state of the NH+4 ion in (NH4)2 PdCl6 has been measured with inelastic neutron scattering. A Grüneisen parameter for the tunneling transitions γtun=−13 has been obtained. The re...

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Bibliographic Details
Published in:The Journal of chemical physics 1984-03, Vol.80 (6), p.2777-2781
Main Authors: PRAGER, M, PRESS, W, HEIDEMANN, A, VETTIER, C
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
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Summary:The pressure dependence of the ground-state tunnel splitting and the energy of transition to the first excited librational state of the NH+4 ion in (NH4)2 PdCl6 has been measured with inelastic neutron scattering. A Grüneisen parameter for the tunneling transitions γtun=−13 has been obtained. The relation between the rotational states and the intermolecular interaction is based on a model theory of Hüller and Raich. The influence of additional higher order terms in the rotational potential is discussed. An exponent n=11±2 of the r-dependent interaction V∼r−n is derived.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.447025