It is generally accepted that nitric oxide (NO) plays an important role in the complex chemistry of the formation and destruction of atmospheric ozone.1 However, its low concentration in the nonurban troposphere, believed to often be ≤10 pptv, presents the analyst of the troposphere with a challenging measurement problem. Investigations in our laboratory show that resonance ionization spectroscopy (RIS) is a promising technique for measuring NO concentrations in the troposphere and also that this technique may be applicable to the detection of a variety of trace tropospheric molecules.

© 1984 Optical Society of America

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