Dynamics in the pretransitional isotropic phase of pentylcyanobiphenyl studied with subpicosecond transient grating experiments
✍ Scribed by F.W. Deeg; M.D. Fayer
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 822 KB
- Volume
- 167
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Transient gratir~ optical Kerr e&t measurements in the isotropic pbase of the nematic liquid crystal pentylcyanobiphenyl (5CB) are presented. Subpicosecond time resolution permits the first direct investigation of the time correlation function for the local mokcular dynamics of the molecules within the pseudonematic domains. Intradomain molecular relaxation is noneaponential with relaxation rates ranging from 1 / 1 ps to l/300 pa The decay characteristics are tempemture it&pent&t to temperatures 35% above the nematic-isotropic phase transition reflecting a decoupling of the local dynamics from the bulk viscosity.