Abstract
The use of a second harmonic diode laser system for monitoring gaseous ammonia in tropospheric air is discussed. Using a 96 m White cell operated at 13 torr pressure in flow mode, a minimum detectable concentration lower than 1 ppbv was obtained.
The NH3 mixing ratio was determined by simultaneous spectroscopic analysis of an atmospheric CO2 line used as a built-in calibration standard.
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Cappellani, F., Melandrone, G. & Restelli, G. Diode laser system for measurement of gaseous ammonia in ambient air. Environ Monit Assess 5, 271–281 (1985). https://doi.org/10.1007/BF00394068
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DOI: https://doi.org/10.1007/BF00394068