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首页> 外文期刊>Review of Scientific Instruments >A unique dosing system for the production of OH under high vacuum for the study of environmental heterogeneous reactions
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A unique dosing system for the production of OH under high vacuum for the study of environmental heterogeneous reactions

机译：A unique dosing system for the production of OH under high vacuum for the study of environmental heterogeneous reactions

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摘要

A unique dosing system for the production of hydroxyl radicals under high vacuum for the study of environmental heterogeneous reactions is described. Hydroxyl radicals are produced by the photodissociation of a hydrogen peroxide aqueous gas mixture with 254 nm radiation according to the reaction H2O2+hv (254 nm)-> OH+OH. Under the conditions of the current design, 0.6 conversion of hydrogen peroxide is expected yielding a hydroxyl number density on the order of 10(10) molecules/cm(3). The flux distribution of the dosing system is calculated using a Monte Carlo simulation method and compared with the experimentally determined results. The performance of this unique hydroxyl dosing system is demonstrated for the heterogeneous reaction with a solid surface of potassium iodide. Coupling of the hydroxyl radical dosing system to a quantitative surface analysis system should help provide molecular level insight into detailed reaction mechanisms. (C) 2008 American Institute of Physics.

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