4296—4302 cm^(–1)范围内氨气光谱线强与自展宽系数测量研究  

Measurement research of line intensity and self-broadening coefficient for NH_(3) spectra in 4296–4302 cm^(–1)

作　　者：龙江雄 邵立 张玉钧[3] 尤坤[3] 何莹 叶庆 孙晓泉 Long Jiang-Xiong;Shao Li;Zhang Yu-Jun;You Kun;He Ying;Ye Qing;Sun Xiao-Quan(State Key Laboratory of Pulsed Power Laser Technology,National University of Defense Technology,Hefei 230037,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,China;National Engineering Research Center for Air Pollution and Greenhouse Gas Monitoring Technology and Equipment,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]国防科技大学脉冲功率激光技术国家重点实验室,合肥230037 [2]先进激光技术安徽省实验室,合肥230037 [3]中国科学院合肥物质科学研究院大气污染和温室气体监测技术与装备国家工程研究中心,合肥230031

出　　处：《物理学报》2022年第16期160-167,共8页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:62033012);安徽省重点研究和开发计划项目(批准号:201904a07020093)资助的课题。

摘　　要：由于HITRAN数据库中NH_(3)在4296—4302 cm^(–1)范围的谱线参数主要源于理论计算,与实际情况存在差异.为了修正数据库中该范围内NH_(3)的谱线参数,本文利用可调谐二极管激光吸收光谱(TDLAS)技术和计量学理论,测量2—10 Torr(1 Torr=133.322 Pa)高纯NH_(3)在4296—4302 cm^(–1)范围内的吸收光谱,综合考虑压强、温度、气池光程、波数、线型拟合等主要影响因素,对NH_(3)在该波段的主要吸收谱线的线强和自展宽系数进行了反演和不确定度计算.测量得到的线强与同行最新测量结果偏差在20%以内,自展宽系数与HITRAN2020数据库偏差在14%以内,二者的不确定度范围分别为0.63%—2.7%和0.77%—5.4%,均小于HITRAN数据库中的不确定度范围10%—20%,测量的部分谱线光谱参数在HITRAN中没有记录,本文获得的结果对于补充和修正HITRAN数据中4296—4302 cm^(–1)范围NH_(3)的谱线参数具有参考意义.Spectral parameters of NH_(3) in a range of 4296-4302 cm^(-1) in the HITRAN database are different from the actual situation as they are derived from theoretical calculations.In order to correct the spectral parameters of NH_(3) in this range in HITRAN,tunable diode laser absorption spectroscopy(TDLAS) technology and metrological theory are used to measure the absorption spectrum high-purity NH_(3) in the range of 4296-4302 cm^(-1)at 2-10 Torr.The line intensity and self-broadening coefficient of the main absorption line of NH3 in this band are retrieved and their uncertainty are calculated by comprehensively considering main factors including pressure,temperature,optical path of gas cell,wavenumber and line shape fitting.The discrepancies between our measured line intensities and latest peer-measured results are within 20%.The biases between our selfbroadening coefficients and the ones in HITRAN2020 are within 14%.Their uncertainties are in a range of the0.63-2.7% and 0.77-5.4%,respectively,which are smaller than the uncertainty range of 10-20% in the HITRAN database.Some of the measured spectral parameters are not recorded in HITRAN.The experimental results in this work are of significant reference in supplementing and correcting the HITRAN spectral parameters of NH_(3) in the range of 4296-4302 cm^(-1).

关 键 词：氨气 激光吸收光谱 TDLAS 线强 自展宽系数 

分 类 号：TQ113.2[化学工程—无机化工]