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- W2023721695 abstract "Abstract The diffusion and mean square fluctuations 〈(δN2〉/〈N〉 of O on Mo(110) have been investigated as functions of coverage and temperature over the range 0.05 ⩽ θ ⩽ 0.9. The diffusion coefficient D, multiplied by 〈(δN2〉/〈N〉 yields the jump diffusion coefficient Dj, which is similar to the single particle or tracer coefficient. The forms D = D0 exp(−βE) and Dj = Dj0 exp(−βEj) with β = 1/kBT are used to analyze the results. Except at θ = 0.9 〈(δN)2〉/〈N〉 is temperature independent, so that E = Ek. E increases from 17 kcal at θ = 0.07 to 26 kcal at θ = 0.5, then drops to 18 kcal atθ = 0.7 and finally rises to t 20 kcal at θ = 0.9. At this coverage Ej ≅ 28 kcal. D0 varies from 1 cm2 s−1 at low coverage to 10−2–10−1 cm2 s−1 at θ = 0.5, then drops to 10−5 cm2 s−1 at θ = 0.9. Dj0 values range from 10−2 cm2 s−1 at θ = 0.05, drop to 2 × 10−4 cm2 s−1 at θ = 0.15, then rise to 10−2 cm2 s−1 at θ = 0.5 and finally decrease to 10−5 cm2 s−1 at higher coverages. There are strong compensation effects between E and Dj0. The variation in E with coverage can be explained in terms of repulsive nearest and attractive farther-than-nearest-neighbor OO interactions, which are suggested by the low θ phase diagram. The coverage dependence of 〈(δN2〉/〈N〉 is complicated, with a minimum at θ ≅ 0.25 and a broad maximum near θ = 0.5." @default.
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- W2023721695 date "1993-06-01" @default.
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- W2023721695 title "Diffusion of oxygen on the Mo(110) plane" @default.
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