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- W85755831 abstract "The surface diffusion (SD) and thermal desorption of CO on Pt was investigated. Depending on the surface coverage (theta) CO is adsorbed in ..cap alpha..- and ..beta..-forms with desorption activation energies of 105-117 and 138-146 kJ/mole, respectively. Initial sticking constants were measured. It was found that the mobilities of these forms differ significantly. From an analysis of the experimental results it is concluded that for 0.3 < theta < 1 the diffusion of CO on a free surface proceeds from a moving boundary. The dependence of the diffusion coefficient (D) of the ..cap alpha..-form on theta was determined; this takes the form of a curve with a maximum D /SUB max/ = 5 X 10/sup -6/ cm/sup 2//sec at theta approx. = 0.4. For the ..beta..-form at 480/sup 0/K D < 3 X 10/sup -8/ cm/sup 2//sec. The width of the initial concentration profile on the sample was determined from a solution of the thermal conductivity equation. Current macromethods of investigating SD are compared." @default.
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- W85755831 date "1985-08-01" @default.
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- W85755831 title "Diffusion of CO molecules on the surface of polycrystalline platinum" @default.
- W85755831 hasPublicationYear "1985" @default.
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