Radicals such as hydroperoxy (HO2•) and hydroxyl (OH•) are thought play a key role in controlling intermediate-temperature (650 < T < 800 K) combustion reactions. While some of these radicals can be detected using spectroscopy in the infrared region, the presence of strongly absorbing stable species often complicates isolation of the radicals' weak absorption lines. Ln addition, the short-lived nature of radicals necessitates an extremely sensitive detection method. Cavity ringdown has been used to observe methyl. (CH3•) and formyl (HCO•) radicals, 1 but has proven ineffective at quantitatively measuring the hydroperoxy radical and others. We have combined a high-finesse cavity with a magneto-optic rotation (MOR) experiment to allow sensitive and selective observation of paramagnetic species. This cavity enhanced magneto-optic rotation (CEMOR) technique has greatly simplified detection of radicals in otherwise crowded regions.

© 2002 Optical Society of America

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