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Detection of Nitric Oxide with Faraday Rotation Spectroscopy at 5.33 μm
Bo Fang1,2, Na-na Yang1,2, Chun-hui Wang1,3, Wei-xiong Zhao*1, Xue-zhe Xu1, Yang Zhang1, Wei-jun Zhang*1,3
1.Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;2.University of Science and Technology of China, Hefei 230026, China;3.School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China
Abstract:
We report the development of a static magnetic field Faraday rotation spectrometer for NO detection. A 5.33 μm continuous-wave quantum cascade laser was used as the probing laser. Line absorption at 1875.81 cm-1(23/2(3/2),υ=1←0) was chosen for the detection. By using a Chernin type multipass cell, a detection precision of 1.15 ppbv (1σ, 1s) was achieved with an absorption pathlength of 108 m. This value was reduced to 0.43 ppbv by increasing the data-acquisition time to 15 s.
Key words:  Faraday rotation spectroscopy, Mid-infrared, Laser spectroscopy, Nitric oxide
FundProject:
5.33 μm处磁旋转吸收光谱NO分子探测研究
方 波1,2, 杨娜娜1,2, 王春晖1,3, 赵卫雄*1, 徐学哲1, 张 杨1, 张为俊*1,3
1.中国科学院安徽光学精密机械研究所,大气物理化学研究室,合肥 230031;2.中国科学技术大学,科学岛分院,合肥 230026;3.中国科学技术大学环境科学与光电技术学院,合肥 230026
摘要:
本文基于直流磁场的磁旋转吸收光谱技术探测研究一氧化氮分子的痕量. 使用5.33 μm连续波量子级联激光器作为探测光源,结合Chernin型光学多通池,在1875.81 cm-1(23/2(3/2),υ=1←0)波长处进行探测. 108 m吸收光程下,实现了1.15 ppbv的探测极限(1s,1σ). 当采样时间延长到15 s,探测极限可提高至0.43 ppbv.
关键词:  磁旋转吸收光谱,中红外,激光光谱,一氧化氮
DOI:10.1063/1674-0068/cjcp1910182
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