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The formation of OH radicals and their diffusion into the gas phase after UV-excitation of TiO 2 in the presence of H 2 O has been studied using the very sensitive and selective detection method of laser-induced fluorescence (LIF). The time-resolved evolution of the OH radical concentration has been observed at different pressures and at varying distances between the photocatalytic surface and the detection volume. H 2 O 2 has been indirectly detected by LIF. The influence of O 2, hydrocarbons, and excitation laser wavelength on the evolution of both species profiles has been studied in this work. The quantum yield for the formation of OH and H 2 O 2 has been estimated by comparison with signals obtained after photolysis of H 2 O 2 in the gas phase.
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Thiebaud et al. (2010) studied this question.
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