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In situ detection of the absorption of atmospheric trace gases in the near infrared is feasible by using a compact intracavity diode laser spectrometer. Provided that an effective absorber length of more than 1 km is achieved, the measurement of atmospheric peroxy radicals such as HO 2 with a detection limit of 2.4 10 7 molecules per cm 3 (1 ppt) is possible. During our...
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