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• W2073475091 abstract "The dissociative chemisorption of methane on metal surfaces is of great practical and fundamental importance. Not only is it the rate-limiting step in the steam reforming of natural gas, the reaction exhibits interesting mode-selective behavior and a strong dependence on the temperature of the metal. We present a quantum model for this reaction on Ni(100) and Ni(111) surfaces based on the reaction path Hamiltonian. The dissociative sticking probabilities computed using this model agree well with available experimental data with regard to variation with incident energy, substrate temperature, and the vibrational state of the incident molecule. We significantly expand the vibrational basis set relative to earlier studies, which allows reaction probabilities to be calculated for doubly excited initial vibrational states, though it does not lead to appreciable changes in the reaction probabilities for singly excited initial states. Sudden models used to treat the center of mass motion parallel to the surface are compared with results from ab initio molecular dynamics and found to be reasonable. Similar comparisons for molecular rotation suggest that our rotationally adiabatic model is incorrect, and that sudden behavior is closer to reality. Such a model is proposed and tested. A model for predicting mode-selective behavior is tested, with mixed results, though we find it is consistent with experimental studies of normal vs. total (kinetic) energy scaling. Models for energy transfer into lattice vibrations are also examined." @default.
• W2073475091 created "2016-06-24" @default.
• W2073475091 creator A5022663242 @default.
• W2073475091 creator A5037460225 @default.
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• W2073475091 date "2014-08-01" @default.
• W2073475091 modified "2023-10-17" @default.
• W2073475091 title "Dissociative chemisorption of methane on metal surfaces: Tests of dynamical assumptions using quantum models and <i>ab initio</i> molecular dynamics" @default.
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• W2073475091 doi "https://doi.org/10.1063/1.4891327" @default.
• W2073475091 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25106565" @default.
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