Measurement of tropospheric OH and HO2 by laser-induced fluorescence at low pressure

P. S. Stevens, J. H. Mather, W. H. Brune

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Abstract

This paper describes an instrument for the sensitive detection of OH in the troposphere using low-pressure laser-induced fluorescence. Ambient air is expanded into a low-pressure detection chamber, and OH is both excited and detected using the A3Σ+(v″ = 0) → X2II(v" = 0) transition near 308 nm. An injector upstream of the detection axis allows for the addition of reagent NO to convert ambient HO2 to OH using the fast reaction HO2 + NO → OH + NO2. Using recent advances in laser and detector technologies, this prototype instrument is able to detect less than 1 × 105 molecules cm-3 (0.004 pptv) of OH with an integration time of 30 s with negligible interferences. -from Authors

Original languageEnglish (US)
Pages (from-to)3543-3557
Number of pages15
JournalJournal of Geophysical Research
Volume99
Issue numberD2
DOIs
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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