Titlebook: Quantum Aspects of Molecular Motions in Solids; Proceedings of an IL Anton Heidemann,Andreas Magerl,Tasso Springer (Pro Conference proceedi

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Conference proceedings 19871st editionchemistry, biology and materials science. The workshop "Quantum Aspects of Molecular Motions in Solids" was jointly organized by the Institut Laue- Langevin and the Institut fiir Festkorperforschung at the Kernforschungsan- lage Jiilich and took place in September 1986 in Grenoble. Tunneling phenome

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Rotational Tunneling of Coupled Groups Studied by Inelastic Neutron Scatteringue to the essentially rigid remainder of the crystal lattice. If the former are small compared with the latter, the spectral structure resulting from coupling is difficult to resolve. However, cooperative phenomena can be observable for systems with low single particle potential barriers and short distances between groups.

FIR

Hindered Rotation and Tunnelling of Adsorbed Speciese structure will usually be available from diffraction. However, for adsorbed systems we are often not able to determine the structure of the surface, what site a molecule occupies when there is a choice, or even the structural relation between adjacent molecules. We give examples of both types of application in this paper.

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Zeeman-Tunnel Resonance Line Shapes in NMRRR Investigations of Rotational Tunnelingequency ν.(≡ γ../2π), in which the saturation and measuring pulses are applied. Anomalies in the recovered magnetization .., measured as a function of .., are expected at Zeeman-tunnel resonance, where ν.= ν.or ν./2 (hence .. = ..(≡ 2πν./γ) or .. = ../2). This of course is a NMR Relaxation Resonance (NMRRR) phenomenon.

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The Orientation of the Rotational Potential in the Crystal Frame:(NH4)2PtCl6tentials have been derived from thermodynamic data, from librational energies, from the tunnel splitting and from Bragg scattering data, and from combinations of these methods. The V(ω) determined from an experiment can only be checked against a model potential calculated from any kind of atom-atom

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