A laser induced fluorescence instrument for measuring tropospheric NO2

C. Fong, W. H. Brune

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Nitrogen dioxide (NO2), an essential gas in atmospheric chemistry, is almost always measured indirectly with just one technique: photolysis of NO2 to NO, followed by detection of resulting NO. However, the photolysis introduces artifact signals that complicate the extraction of the NO2 signal at low NO2 volume mixing ratios. A new prototype instrument uses laser induced fluorescence to measure tropospheric NO2 directly. The atmospheric fluorescence spectra measured with this instrument match the fluorescence spectra of NO2 in a reference cell over the wavelength range 565.1-565.2 nm. This match indicates that fluorescence from other chemical species is not interfering with the measurements. The prototype's current detection limit is 280 parts per trillion (pptv) in 2.5 min with an absolute uncertainty of ±15% (2σ confidence). This detection limit, which can be improved with better optical filtering and more laser power, is currently adequate for urban air conditions.

Original languageEnglish (US)
Pages (from-to)4253-4262
Number of pages10
JournalReview of Scientific Instruments
Volume68
Issue number11
DOIs
StatePublished - Nov 1997

All Science Journal Classification (ASJC) codes

  • Instrumentation

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