Collective and single particle diffusion on surfaces

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Recent developments in the molecular modeling of diffusion in nanoporous materials (2007, background): “Transport diffusivity describes the transport of mass and the decay of density fluctuations in the system, while self-diffusion describes the diffusive motion of a single particle [2,20,43].”
AB Initio Atomistic Thermodynamics and Statistical Mechanics of Surface Properties and Functions (2004, background): “And the complexity increases of course further, when diffusion along island edges, across steps and around defects needs to be treated in detail ( Ala-Nissila, Ferrando and Ying, 2002 ).”
Structural properties of nanoclusters: Energetic, thermodynamic, and kinetic effects (2005, methodology): “The disadvantage is that the (even qualitative) accuracy of these potentials is often questionable, and they must be tested carefully before being used (see for example Ala-Nissila et al. (2002)).”