Detection of NO3 in the polluted troposphere by differential optical absorption
Detection of NO3 in the polluted troposphere by differential optical absorption
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DOI：
10.1029/gl007i001p00089
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发表时间：
1980
影响因子：
5.2
通讯作者：
U. Platt;D. Perner;A. Winer;G. Harris;J. Pitts
中科院分区：
文献类型：
--
作者：
U. Platt;D. Perner;A. Winer;G. Harris;J. Pitts
利用长径（970和750 m）差分光学吸收光谱在洛杉矶盆地的两个地点首次确定和测量了污染对流层中的硝酸盐自由基NO3。在623和662 nm处，利用NO3强吸收带测量了355 ppt的NO3浓度。在1979年9月11日至9月19日的污染事件中，浓度在日落后急剧上升，并在大约1小时后的20:00 （PDT）达到峰值。在许多其他情况下，峰值浓度要低得多，有时低于几个ppt的检测极限。考虑了污染条件下NO3自由基的可能汇，包括与NO的反应，与有机物质的反应，以及N2O5的水解，并推导出了新的上限速率常数。
The nitrate radical, NO3, has been identified and measured for the first time in the polluted troposphere using long path (970 and 750 m) differential optical absorption spectroscopy at two sites in the Los Angeles basin. NO3 concentrations of up to 355 ppt were measured using the strong NO3 absorption bands at 623 and 662 nm. During pollution episodes from September 11 to September 19, 1979 concentrations increased sharply after sunset and peaked about one hour later at ∼ 20:00 (PDT). In many other cases peak concentrations were much lower and sometimes below the detection limit of several ppt. Possible sinks for the NO3 radical under polluted conditions are considered, including reaction with NO, reaction with organic species, and the hydrolysis of N2O5 for which a new upper limit rate constant is derived.