Abstract

An atmospheric monitor with a detectability of 0.6 ppbv, utilizing a compact He–Cd laser at 442 nm for excitation of the NO₂ molecules is described. Photon-counting techniques were employed to detect the NO₂ fluorescence transmitted through a bandpass liquid solution filter that did not fluoresce upon absorption of scattered laser light. Operational characteristics of the instrument are described. Results obtained in ambient air monitoring are presented.

© 1975 Optical Society of America

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