Abstract
FLASH photolysis of mixtures of water and argon can produce hydroxyl radicals with a spectroscopically detectable lifetime sufficient to allow kinetic investigations to be carried out. This was achieved by Black and Porter1 and Greiner2,3 with a vacuum ultra-violet flash photolysis apparatus; in our case a standard apparatus was modified by using a flash lamp and a reaction vessel made of Spectro-sil quartz (which transmits ultra-violet radiation down to 1620 Å (ref. 4)) and by flowing dried nitrogen through the reflector for about 1 h before and during each experiment to displace atmospheric oxygen and water vapour. Water was used as the precursor of hydroxyl radicals because H-abstraction by OH cannot affect the OH concentration, whereas H-abstraction from any other substrate results in rapid OH-decay. Furthermore, the system is simple, because radiation absorbed by the first absorption region of water vapour (1400–1850 Å) causes only one photochemical reaction1,5,6
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HORNE, D., NORRISH, R. Rate of H-abstraction by OH from Hydrocarbons. Nature 215, 1373–1374 (1967). https://doi.org/10.1038/2151373a0
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DOI: https://doi.org/10.1038/2151373a0
