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Time-Resolved Laser-Flash Photolysis Faraday Rotation Spectrometer: A New Tool for Total OH Reactivity Measurement and Free Radical Kinetics Research

文献类型：期刊论文

作者Wei, Nana1,2; Fang, Bo1,2; Zhao, Weixiong2; Wang, Chunhui1,2; Yang, Nana1,2; Zhang, Weijun1,2; Chen, Weidong3; Fittschen, Christa4
刊名ANALYTICAL CHEMISTRY
出版日期2020-03-17
卷号92
ISSN号0003-2700
DOI10.1021/acs.analchem.9b05117
通讯作者Zhao, Weixiong(wxzhao@aiofm.ac.cn) ; Zhang, Weijun(wjzhang@aiofm.ac.cn)
英文摘要The total OH reactivity (k(OH)') is an important parameter for quantitative assessment of the atmospheric oxidation capacity. Although laboratory measurement of kOH' has been achieved 20 years ago, the instruments required are often costly and complex. Long-term atmospheric observations remain challenging and elusive. In this work, a novel instrument combining laser-flash photolysis with a mid-infrared Faraday rotation spectrometer (LFP-FRS) has been developed for the measurement of kOH' and for studying gas phase free radical kinetics. The reactor is composed of a Herriott-type optical multipass cell, and OH radicals were generated by flash photolysis of ozone with a 266 nm pulsed Nd:YAG laser. The decay of the OH signal was directly measured with a time-resolved FRS spectrometer at 2.8 mu m. The overlapping path length between the pump beam and probe beam was 25 m. High performance was achieved by subtracting the signals before and after flash photolysis to eliminate interferences caused by H2O absorption and background drift. The optimum precisions (1 sigma) of OH concentration and kOH' measurement were 4 x 10(6) molecules cm(-3) and 0.09 s(-1) over data acquisition times of 56 and 112 s, respectively. The performance of the system was evaluated by the reaction of OH with CO and NO. The measured rate coefficients (k(OH+CO) and k(OH+NO)) were in good agreement with values reported in the literature. The developed LFP-FRS provides a new, high precision, and highly selective tool for atmospheric chemistry research of OH radicals and other transient paramagnetic free radicals such as HO2 radicals.
WOS关键词GAS-PHASE REACTIONS ; ATMOSPHERIC CHEMISTRY ; PHOTOCHEMICAL DATA ; DIODE-LASER ; MU-M ; SPECTROSCOPY ; PUMP ; HO2
资助项目National Natural Science Foundation of China[41627810] ; National Natural Science Foundation of China[91544228] ; Instrument Developing Project of the Chinese Academy of Sciences[YZ201626] ; Youth Innovation Promotion Association CAS[2016383] ; CASHIPS Director's Fund[BJPY2019B02] ; CASHIPS Director's Fund[YZJJ2018QN7] ; CAS President's International Fellowship Initiative (PIFI) project
WOS研究方向Chemistry
语种英语
出版者AMER CHEMICAL SOC
WOS记录号WOS:000526563900023
资助机构National Natural Science Foundation of China ; Instrument Developing Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; CASHIPS Director's Fund ; CAS President's International Fellowship Initiative (PIFI) project
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/103653]  
专题中国科学院合肥物质科学研究院
通讯作者Zhao, Weixiong; Zhang, Weijun
作者单位1.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Atmospher Physicochem, Hefei 230031, Anhui, Peoples R China
3.Univ Littoral Cote dOpale, Lab Physicochim Atmosphere, F-59140 Dunkerque, France
4.Univ Lille, CNRS, UMR 8522, PC2A Physicochim Proc Combust & Atmosphere, F-59000 Lille, France
推荐引用方式
GB/T 7714		 Wei, Nana,Fang, Bo,Zhao, Weixiong,et al. Time-Resolved Laser-Flash Photolysis Faraday Rotation Spectrometer: A New Tool for Total OH Reactivity Measurement and Free Radical Kinetics Research[J]. ANALYTICAL CHEMISTRY,2020,92.
APA Wei, Nana.,Fang, Bo.,Zhao, Weixiong.,Wang, Chunhui.,Yang, Nana.,...&Fittschen, Christa.(2020).Time-Resolved Laser-Flash Photolysis Faraday Rotation Spectrometer: A New Tool for Total OH Reactivity Measurement and Free Radical Kinetics Research.ANALYTICAL CHEMISTRY,92.
MLA Wei, Nana,et al."Time-Resolved Laser-Flash Photolysis Faraday Rotation Spectrometer: A New Tool for Total OH Reactivity Measurement and Free Radical Kinetics Research".ANALYTICAL CHEMISTRY 92(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

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