Abstract
Angle-resolved thermal programmed reaction was used to investigate the hydrogenation of methyl radicals on Pt(111). The angular distribution of desorbing methane produced at 240 K was strongly peaked towards the surface normal and the reaction displayed little kinetic isotope effect. When microscopic reversibility arguments are applied, these observations suggest that dissociative chemisorption of CH 4 on an extensively H covered Pt(111) surface will display a sharply angle dependent sticking coefficient and little evidence for tunneling.
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