Abstract
We report on spectroscopic real-time detection of in ambient air. Our measurements were carried out by means of cavity leak-out absorption spectroscopy employing a tunable cw laser in the mid-infrared spectral region near . A CO laser in combination with tunable microwave sideband generation was used as the light source. Using a 50-cm-long ringdown cell with mirrors, we achieved a detection limit of 290 parts in (ppt) in ambient air (integration time, 100 s). The corresponding noise-equivalent absorption coefficient was .
© 2000 Optical Society of America
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