Abstract
VARIOUS workers have used methods of time-resolved absorption spectroscopy to study the formation and decay of free radicals produced in pulsed electric discharges. These investigations have been confined to the use of a single parent substance which normally flows through the discharge tube at a rate such that the parent substance is not completely replenished before each discharge pulse. In this way the absorption spectra of OH (ref. 1), CN (ref. 2) and of several halides such as BBr, BCl, AlBr, AlCl, All and SiCl3,4 have been observed. The main limitation in this work was low intensity of the background sources used, and a large number of exposures were needed to obtain an adequate record with both high dispersion and good time resolution. The use of a flash tube filled with an inert gas as background source greatly reduces the number of exposures needed to obtain an adequate record and this removes the difficulty of studying systems where the discharge tube has to be refilled after each exposure.
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