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In this paper we present the results of model calculations on the rotational motion of linear molecules in dense systems. To this end we have developed a matrix description for the rotational diffusion, which is extended in this article to the J-diffusion limit. Closed expressions are obtained for the orientational, angular momentum, and rotational energy autocorrelation functions. The precise time dependence of these correlation functions is determined by the time distribution of collisions and the magnitude of energy and momentum transfer during a collision. A systematic analysis of the role of these two effects on the rotational relaxation is presented
We derive a relation between the static structure factor for a mixture and experimental quantities that can be extracted from a Rayleigh-Brillouin light scattering experiment: the Landau-Placzek ratio and Brillouin shift. Partial structure factors are related to the thermodynamic quantities that characterize a mixture in a similar way as the Kirkwood-Buff integrals. In a He + Xe noble gas mixture, the spectrum is dominated by the contribution due to the XtXe correlations in the mixture. We compare experimental results to calculations using the van der Waals equation of state. The other two partial structure factors can be obtained in an approximate way from a mixing rule for the partial static structure factors. Thus, it is possible to obtain approximate values for the isothermal compressibility, the osmotic compressibility, and th...
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