Dipole moment and far infra-red absorption of quinuclidine (1-aza-bicyclo-[2-2-2]-octane) |
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| Authors: | B Lassier C Brot N Dat-Xuong |
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| Institution: | 1. Laboratoire de Physique de la Matière Condensée, Université de Nice , Parc Valrose, 06034, Nice, FranceLaboratoire associé au CNRS No. 190.;2. Institut de Chimie des Substances Naturelles du CNRS , 91 Gif-sur-Yvette, France |
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| Abstract: | Incoherent quasi-elastic neutron-scattering spectra have been measured on powder samples of D-BPBAC in its smectic E, B and A phases using the high-resolution backscattering technique. The data have been analysed in terms of translational diffusion and a localized rotational motion. It has been found that the apparent translational diffusion constant has a temperature dependent value of ～1 × 10-6 cm2 s-1 in the smectic A phase but is smaller by at least an order of magnitude in the smectic B and E phases. Comparison of the widths of the rotational components of the spectra with other measurements suggests that simple rotational models are not adequate to explain the experimental data. |
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