Surface diffusion of hydrogen on Ru(001) studied using laser-induced thermal desorption
Authors:
- 1 August 1986
- journal article
- conference paper
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 85 (3) , 1676-1680
Abstract
The surface diffusion coefficient for hydrogen on Ru(001) at low coverage was measured using laser‐induced thermal desorption techniques. In the temperature range between 260 and 330 K, the diffusion coefficients displayed Arrhenius behavior with an activation barrier Ediff=4.0±0.5 kcal and a preexponential factor D0=6.3×10−4 cm2/s. Agreement between the experimental and theoretical parameters suggests that hydrogen diffuses on the surface by moving from a threefold site to a neighboring threefold site via a twofold site. Surface contaminants such as carbon and oxygen were observed to produce dramatic effects on the hydrogen surface diffusion rate.Keywords
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