Consideration of dielectric relaxation and the Kerr-effect relaxation in relation to the reorientational motions of molecules
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 72, 1482-1493
- https://doi.org/10.1039/f29767201482
Abstract
Relations between field-free orientational time-correlation functions and dielectric and Kerr-effect responses to step-on and step-off electric fields are considered. Whereas the dielectric and Kerr-effect decay transients are simply related to 〈P1(u, t)〉 and 〈P2(u, t)〉, where u= cos θ, the rise transients are not, in general, related to these quantities; assumptions and specific reorientation mechanisms are required in order to understand the rise transients. The dielectric and Kerr-effect relaxations are considered for the models of rotational diffusion and “fluctuation relaxation”. Experimental data for poly-n-butylisocyanate in solution and tritolyl phosphate are discussed in terms of the theory and mechanisms for motion.Keywords
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