Abstract
Transient grating optical Kerr effect measurements in the isotropic phase 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 molecular dynamics of the molecules within the pseudonematic domains. Intradomain molecular relaxation is nonexponential with relaxation rates ranging from 1/1 ps to 1/300 ps. The decay characteristics are temperature independent to temperatures 35°C above the nematic-isotropic phase transition reflecting a decoupling of the local dynamics from the bulk viscosity.
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