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深水 发表于 2008-3-27 01:03

A unique dosing system for the production of hydroxyl radicals..

A unique dosing system for the production of hydroxyl radicals under high vacuum for the study ofu*V3~:~^?'FJ
environmental heterogeneous reactions is described. Hydroxyl radicals are produced by thep!m6^0NQ^[
photodissociation of a hydrogen peroxide aqueous gas mixture with 254 nm radiation according to
\)n)]qmjF-D the reaction H2O2+h

254 nm→OH+OH. Under the conditions of the current design, 0.6%
d-a zA8l/B*p conversion of hydrogen peroxide is expected yielding a hydroxyl number density on the order of
3L[,`6^!x]w SL 1010 molecules/cm3. The flux distribution of the dosing system is calculated using a Monte Carloe)AwAF*_
simulation method and compared with the experimentally determined results. The performance of-NY9py|$C;lm-~ `
this unique hydroxyl dosing system is demonstrated for the heterogeneous reaction with a solid;CKnE"H6B*T0G
surface of potassium iodide. Coupling of the hydroxyl radical dosing system to a quantitativeF `u a,\ P+JL
surface analysis system should help provide molecular level insight into detailed reaction#}{T8\| OYe
mechanisms. © 2008 American Institute of Physics.

longshan1963 发表于 2008-4-3 14:49

:) :@

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