Diode laser system for measurement of gaseous ammonia in ambient air |
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| Authors: | F Cappellani G Melandrone G Restelli |
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| Institution: | (1) Commission of the European Communities, Joint Research Centre, Ispra Establishment, 1-21020 Ispra (Varese), Italy |
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| 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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