A technique for studying free-radical reactions in gases.

The apparatus used typically consists of a long glass or quartz tube holding the gas, with a lamp outside the tube suitable for producing an intense flash of light. This dissociates molecules in the sample creating free radicals, which can be detected spectroscopically by a beam of light passed down the axis of the tube.

It is possible to focus the spectrometer on an absorption line for a particular product and measure its change in intensity with time using an oscilloscope.