Abstract
The reorientational correlation times of liquid diphenyl methane and of diphenyl ether have been measured by depolarized light scattering as a function of temperature and pressure. The data yield activation energies and activation volumes. The viscosity dependence of the correlation times is well described by an extended Stokes–Einstein–Debye equation. The data indicate that the reorientational motion observed can to a good approximation be described in terms of a single-molecule motion. The two sets of data obtained from the two liquids are in many respects very similar. However, the more polar diphenyl ether displays larger values of the activation parameters.
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