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- W1980812451 abstract "The adsorption-desorption kinetics of CO from ultrathin epitaxial Pd films has been studied using modulated molecular beam techniques. We find that the rate constant for desorption, kd, is nearly four orders of magnitude higher for the monolayer Pd film than that for the bilayer film. The rate decreases further by a factor of 7 between 2 and 6 monolayers at which kd attains the value seen on Pd single crystals. We conclude that although a bilayer film is similar to a bulk Pd(111) surface in binding CO, true bulk-like behavior is only reached above six atomic layers of Pd. Temperature programmed desorption at low coverage can be fit using the beam determined kinetic parameters, showing that defects play no major role in the beam experiments. Significant departures in the values of the activation energy for desorption and the preexponential factor for the monolayer film from expected values are attributed to a possible adsorbate induced surface reconstruction." @default.
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- W1980812451 date "1993-06-01" @default.
- W1980812451 modified "2023-09-26" @default.
- W1980812451 title "Desorption kinetics of CO from epitaxial Pd films on W(110) in the low coverage limit" @default.
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- W1980812451 doi "https://doi.org/10.1016/0039-6028(93)90659-8" @default.
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