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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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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description 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.
doi_str_mv 10.1063/1.447025
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source AIP Journals (American Institute of Physics)
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
title The pressure dependence of rotational states in (NH4)2 PdCl6
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