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- W1966457852 abstract "Angular distributions of CO2, I(γr), formed by catalytic reaction between CO and O2 on a stepped Pt(111) surface, have been measured by means of molecular beam techniques as a function of CO and O coverages, in the presence of “subsurface oxide”, and at varying temperatures. The resulting data can well be fitted by I(γr) = a cos γr + (1−a) cos7γr with a being an adjustable parameter which varies with the surface conditions. The cos γr part is ascribed to particles which were completely accommodated with their translational energy to the surface temperature before leaving the surface, while the cos7γr channel corresponds to molecules carrying excess translational energy from crossing the activation barrier of the surface reaction. The fraction of thermally accommodated particles increases by the presence of steps or “subsurface oxide”, and decreases with O and CO coverage as well as with increasing temperature. The effect of coverage can qualitatively be attributed to the varying participation of defect sites in product formation, while the influence of surface temperature is well reproduced in the framework of a general theoretical model. Scattering experiments with CO2 revealed that the trapping probability for this molecule (in the temperature range interesting here) is of the order of 0.5, thus confirming the conclusion of incomplete thermal accommodation of a CO2 molecule interacting with a Pt(111) surface." @default.
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- W1966457852 date "1984-03-01" @default.
- W1966457852 modified "2023-10-18" @default.
- W1966457852 title "Catalytic oxidation of CO on Pt(111): The influence of surface defects and composition on the reaction dynamics" @default.
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- W1966457852 doi "https://doi.org/10.1016/0039-6028(84)90262-0" @default.
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