Inelastic coherent neutron scattering on TBBA in the low temperature phases
Open Access
- 1 January 1978
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 39 (2) , 173-179
- https://doi.org/10.1051/jphys:01978003902017300
Abstract
Inelastic coherent neutron scattering experiments have been performed on a nondeuterated single crystal of TBBA which is transformed by melting into a single smectic domain. Despite the strong incoherent background, it was possible to determine several acoustic longitudinal and transverse dispersion branches in three phases : solid (VIII), smectic B (V) and smectic VI. The transverse mode (rigid layer mode) propagating perpendicular to the layers of molecules has been observed in the solid phase (0.15 THz at the zone boundary), while in the smectic B phase, this mode could no longer be resolved. The experiment was not performed for the smectic VI mesophaseKeywords
This publication has 6 references indexed in Scilit:
- Ondes transverses dans les smectiques Ba, Bc et E aJournal de Physique Lettres, 1977
- Dispersion of Collective Excitations in a Nematic Liquid CrystalPhysical Review Letters, 1976
- Polymorphism of the Mesomorphic Compound Terephthal-bis-Butylaniline (TBBA)Physical Review Letters, 1974
- Uniaxial rotational diffusion in the smectic B phase of TBBA observed by quasi-elastic neutron scatteringJournal de Physique Lettres, 1974
- Raman spectra of the smectic and nematic liquid crystal TBBAJournal de Physique Lettres, 1974
- Long and Short Range Order in the Crystalline and Smectic B Phases of Terephthal-Bis-Butylaniline (TBBA)Molecular Crystals and Liquid Crystals, 1973