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- W1963509372 abstract "The kinetics of methane trapping on ethylidyne-covered Pt(111) were investigated using supersonic molecular beam techniques at surface temperatures between the temperature at which methane desorbs from the monolayer and from a second layer. The inability of the Langmuir,1 Kisliuk,2 or modified Kisliuk3,4 models to fit the temperature dependence of the adsorption probability prompted the derivation of a model in which adsorption is forced through an extrinsic precursor. The difference in activation energies for desorption from the precursor state and migration of the extrinsic precursor, Ed‘ − Em‘, is 5.4 kJ/mol, and the ratio of preexponential factors, / , is 2 × 104. The difference in activation energies suggests that the extrinsic precursor makes about 105 site hops near the desorption temperature in search of a binding site. The high degree of corrugation in the gas−surface potential may be responsible for the relatively high barrier to migration in the extrinsic precursor." @default.
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- W1963509372 date "2001-03-30" @default.
- W1963509372 modified "2023-10-16" @default.
- W1963509372 title "The Extrinsic Precursor Kinetics of Methane Adsorption onto Ethylidyne-Covered Pt(111)" @default.
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- W1963509372 doi "https://doi.org/10.1021/jp003988s" @default.
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