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Proceedings Paper

Kinetics of gas-phase tropospheric reactions of organic solvents and hydroxyl radical by laser photolysis laser-induced fluorescence
Author(s): Michael Kompitsas; A. Mellouki; Georges Le Bras; F. Roubani-Kalantzopoulou; A. Mavropoulos; I. Bassiotis
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Paper Abstract

Hydroxyl gas-phase reactions play a very important role in air pollution. For the majority of chemical compounds of the atmosphere, the reaction with OH radical s is an intermediate one, part of a long chain reaction. A laser photolysis-laser induced fluorescence technique has been sued to study OH reaction kinetics with dioxane. The apparatus consists of two synchronized pulsed laser systems, a six cross flow/steady gas reactor, a photomultiplier for LIF detection and control electronics. The first laser is used for the production of OH radicals by photolysis. The second laser provides a probe-beam which excites the OH radical electronically. Then, the relative population of OH radicals is monitored time-resolved by laser induced fluorescence. All experiments are performed under pseudo- first order kinetic conditions. The major advantages of this technique are: (1) Capability to measure OH reaction kinetics over an extended temperature range, with different reactants using the same apparatus. (2) Generation of a clean source of OH radicals. (3) Capability of atmospheric pressure measurements. (4) Micro-scale simulation of atmospheric reactions.

Paper Details

Date Published: 14 July 1998
PDF: 5 pages
Proc. SPIE 3423, Second GR-I International Conference on New Laser Technologies and Applications, (14 July 1998); doi: 10.1117/12.316598
Show Author Affiliations
Michael Kompitsas, Lab. de Combustion et Systemes Reactifs/CNRS (Greece)
A. Mellouki, Lab. de Combustion et Systemes Reactifs/CNRS (France)
Georges Le Bras, Lab. de Combustion et Systemes Reactifs/CNRS (France)
F. Roubani-Kalantzopoulou, National Technical Univ. of Athens (Greece)
A. Mavropoulos, National Technical Univ. of Athens (Greece)
I. Bassiotis, National Technical Univ. of Athens (Greece)


Published in SPIE Proceedings Vol. 3423:
Second GR-I International Conference on New Laser Technologies and Applications
Alexis Carabelas; Paolo Di Lazzaro; Amalia Torre; Giuseppe Baldacchini, Editor(s)

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