The initial sticking coefficient (probability for dissociative chemisorption) has been measured for O2 on a Pt(111) surface as a function of initial energy, incident angle, and surface temperature using molecular beam techniques. The results reveal two distinct mechanisms for sticking; precursor mediated and direct dissociation, either of which can dominate depending upon the initial adsorption conditions.
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Williams et al. (1988) studied this question.
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