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We model a system of disorder by utilizing a lattice on which the sites are characterized by energies, which are highly disordered, as they are chosen from a given distribution of energy values (say, from a uniform distribution in a given range), and thus every single site is characterized by a different energy value. Diffusion of single isolated particles is thermally activated, and follows Boltzmann...
Measurements of the collective diffusion coefficient D c at equilibrium are difficult because they are based on monitoring low amplitude concentration fluctuations generated spontaneously, that are difficult to measure experimentally. A new experimental method has been recently used to measure time-dependent correlation functions from the diffraction intensity fluctuations and was applied...
The barrier model with random distribution of barrier energies is considered at nonzero particle concentrations. The statistical mechanics expressions for the jump diffusion coefficient that takes into account interparticle interactions are derived for dynamic and static disorder. For the former case the analytical expression for the barrier energy contribution is calculated, while for the latter...
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