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Details van artikel 6 van 14 gevonden artikelen
| Titel: |
Dielectric relaxation and depolarized dynamic light scattering of a generalized Debye model fluid |
| Auteur: |
Schurr, J. Michael |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 40 (1980) nr. 5 pagina's 1025-1051 |
| Jaar: |
1980-08-10 |
| Inhoud: |
The simultaneous translational and rotational brownian motions of an assembly of interacting cylindrically symmetric polar molecules are assumed to obey a generalized N-particle Smoluchowski-Einstein-Debye equation. Rigorous relations are derived between the self-rotational diffusion coefficient and the initial slopes of the pertinent orientation correlation functions for both dielectric relaxation and depolarized dynamic light scattering. These exact results are obtained by an appropriate generalization of the rigorous treatment of Ackerson for the initial slope of the normalized dynamic structure factor of an assembly of interacting spherically symmetric translational diffusers. An approximate relation between the autocorrelation function of the net permanent dipole moment and that of the total dipole moment of an isolated dielectric sphere is obtained by generalizing Onsager's treatment of the external moment and reaction field to the case of a randomly varying time-dependent permanent dipole moment in the cavity. Approximations in this development essentially affect only the contribution of the induced moments. Under the assumption that the total dipole moment exhibits a single exponential decay, a relation between the self-rotational diffusion coefficient and the measured dielectric relaxation time is finally obtained. A comparison of (6DR)-1 reorientation times obtained from dielectric relaxation, dynamic light scattering, N.M.R., and N.Q.R. is presented for several polar compounds. The present dielectric relaxation reorientation times fall about 30 per cent below perfect agreement with times obtained from dynamic light scattering and N.M.R. The possible role of jump diffusion in contributing to this discrepancy is considered. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 14 gevonden artikelen
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