Author(s)

F. Jeanneret, F Kirchner, A Clappier, H. van den Bergh and B Calpini

Abstract

In-situ OH Kinetics Study Providing an Indicator for Ozone Formation Limitation Guest contribution F. Jeanneret, F Kirchner, A Clappier, H. van den Bergh and B Calpini Group, Introduction The hydroxyl radical dominates the daytime chemistry in the troposphere. This latter is responsible for the reactive removal of the most trace gases such as Volatile Organic Compounds (VOC) and is an active participant in the NO and NO: cycle. A new technique, Pump-and-Probe LIDAR, to investigate the OH chemistry in the Planetary Boundary Layer (PEL) is presented (Calpini et ai, 1998). The method consists of a high OH concentration production by a first laser beam (pump) inducing a flash photolysis of ozone Os + hv (256 nm) -» O(*D) + O: and the reaction O('D) + H%O -> 2OH . Its relaxation is then followed by the measurement of the time evolution of the radical by la

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