The viscosity dependence of reorientation correlation times tgr;Vthgr;for a number of neat liquid monosubstituted benzenes and several symmetric top molecules has been analyzed in terms of Hu and Zwanzigrsquo;s hydrodynamic slip limit and also the parameter kgr; introduced by Kivelson. The slip limit predictions are improved by introducing a weighting factor which emphasizes molecular shape. The analysis of our high pressure data shows that the parameter kgr; is independent of pressure and temperature, in agreement with the results of other studies. The coupling between translational and rotational motions as characterized by kgr; is dominated by the molecular shape.
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