Collision-induced activation of the β-hydride elimination reaction of isobutyl iodide dissociatively chemisorbed on Al(111)

Autor:	Lawrence H. Dubois, Ralph G. Nuzzo, Shrikant P. Lohokare, Elizabeth L. Crane
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Hydride Iodide General Physics and Astronomy Kinetic energy Photochemistry Threshold energy Endothermic process Chemical kinetics Elimination reaction chemistry Atom Physical chemistry Physical and Theoretical Chemistry
Zdroj:	The Journal of Chemical Physics. 108:8640-8650
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.476294
Popis:	The collision-induced activation of the endothermic surface reaction of isobutyl iodide chemisorbed on an Al(111) surface is demonstrated using inert-gas, hyperthermal atomic beams. The collision-induced reaction (CIR) is highly selective towards promoting the β-hydride elimination pathway of the chemisorbed isobutyl fragments. The cross section for the collision-induced reaction was measured over a wide range of energies (14–92 kcal/mol) at normal incidence for Ar, Kr, and Xe atom beams. The CIR cross section exhibits scaling as a function of the normal kinetic energy of the incident atoms. The threshold energy for the β-hydride elimination reaction calculated from the experimental results using a classical energy transfer model is ∼1.1 eV (∼25 kcal/mol). This value is in excellent agreement with that obtained from an analysis of the thermally activated kinetics of the reaction. The measured cross section shows a complex dependence on both the incident energy of the colliding atom and the thermal energy ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::076a9a86070d2a3fecac866885a84e4a https://doi.org/10.1063/1.476294 Zobrazit plný text záznamu