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- C. Fong
- Department of Meteorology, 503 Walker Building, Pennsylvania State University, Pennsylvania 16802
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- W. H. Brune
- Department of Meteorology, 503 Walker Building, Pennsylvania State University, Pennsylvania 16802
抄録
<jats:p>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.</jats:p>
収録刊行物
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- Review of Scientific Instruments
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Review of Scientific Instruments 68 (11), 4253-4262, 1997-11-01
AIP Publishing
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キーワード
詳細情報 詳細情報について
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- CRID
- 1361137045541121792
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- NII論文ID
- 30015943201
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- ISSN
- 10897623
- 00346748
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- データソース種別
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