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• W2034014102 endingPage "9685" @default.
• W2034014102 startingPage "9674" @default.
• W2034014102 abstract "An isokinetic molecular dynamics simulation of argon adsorbed on several model amorphous surfaces of titanium dioxide is carried out. The solid is represented by the Bernal Model in which the surface is taken to be the exposed face of a dense random packing of oxide ions. This surface is roughened by deleting varying numbers of oxides at random from the outer layer of the solid. Surface diffusion in the limit of very low coverage (tracer diffusion) is evaluated by following the dynamics of noninteracting single adatoms. The diffusion coefficient in the zero-density limit is calculated from velocity autocorrelation functions for adatoms at several temperatures ranging from 85 to 300 K. The temperature dependence of the diffusion constants obtained in this way shows nearly Arrhenius behavior in this temperature range. It is shown that surface roughening at the atomic scale give rise to a higher apparent activation energy for diffusion. A statistical characterization of the adsorptive field through distributions of local maxima and minima in the adsorption energy surface along the diffusion paths was performed in order to relate the surface diffusion of monatomic species on amorphous surfaces to the recently proposed Dual Site-Bond Description of Heterogeneous Surfaces (DSBD). Independent evidence supporting the theoretical hypothesis of the DSBD is also obtained." @default.
• W2034014102 created "2016-06-24" @default.
• W2034014102 creator A5026946634 @default.
• W2034014102 creator A5057212818 @default.
• W2034014102 date "1996-12-01" @default.
• W2034014102 modified "2023-09-27" @default.
• W2034014102 title "Molecular dynamics study of tracer diffusion of argon adsorbed on amorphous surfaces" @default.
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• W2034014102 doi "https://doi.org/10.1063/1.472797" @default.
• W2034014102 hasPublicationYear "1996" @default.
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