title: Diode laser system for measurement of gaseous ammonia in ambient air.
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.
authors.affiliation: Commission of the European Communities, Joint Research Centre, Ispra Establishment, 1-21020, Ispra (Varese), Italy.
authors.forename: F
authors.initials: F
authors.lastname: Cappellani
authors.forename: G
authors.initials: G
authors.lastname: Melandrone
authors.forename: G
authors.initials: G
authors.lastname: Restelli