水汽分子对CO<sub>2</sub>谱线加宽的影响

王欢; 曹振松; 汪六三; 高伟; 张为俊; 龚知本; 高晓明

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水汽分子对CO₂谱线加宽的影响

王欢^1,2,
曹振松^1,2,
汪六三^1,2,
高伟^1,2,
张为俊²,
龚知本¹,
高晓明^1,2

1.
中国科学院安徽光学精密机械研究所大气成分与光学重点实验室, 合肥 230031 ;
2.
中国科学院安徽光学精密机械研究所环境光谱学实验室, 合肥 230031

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出版历程
- 刊出日期: 2010-08-17

Effect of water vapor on spectrum broadening of CO₂

1.
Key Laboratory of the Atmospheric Composition and Optical Radiation,Chinese Academy of Sciences,Hefei 230031,China;
2.
Laboratory of Environmental Spectroscopy,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China

摘要

摘要: 报道了以高分辨力连续可调谐中红外差频激光为探测光源，结合可调长光程怀特池，利用直接吸收的方法探测了CO2的10011←10002带R支以及部分P支在室温下的水汽加宽吸收光谱。在2 422 cm-1到2 457 cm-1范围内共有26条吸收谱线被探测到，采用Voigt线型对吸收谱线进行拟合，得到了CO2光谱的水汽加宽系数，结果显示CO2的水汽加宽系数平均比干燥空气的加宽系数大52%。利用实验测得的CO2的水汽加宽系数与HITRAN04数据库中CO2谱线的线位置、线强和干燥的空气加宽系数进行比较，分析了在实际大气中(海平面，10 km光程)不存在水汽和存在水汽(含有2.0 kPa水汽)时该波段CO2的大气透过率，结果表明潮湿空气与干燥空气之间的最大透过率差约为0.5‰。
- 差频激光 /
- CO2 /
- 吸收光谱 /
- 水汽加宽系数Key words: difference frequency generation /
- CO2 /
- absorption spectrum /
- water vapor broadening coefficients
Abstract: Using a high resolution continuous-wave mid-infrared difference frequency generation spectrometer and a long adjustable optical path White cell, water vapor pressure broadening coefficients for 22 transitions in the R branch and last 4 transitions in the P branch of the 10011←10002 band of CO2 has been detected at room temperature. The recorded lineshapes were fitted with Voigt line profile in order to determine the water vapor collisional broadening coefficients of 26 CO2 transitions from 2 422 cm-1 to 2 457 cm-1，the result shows that the water vapor collisional broadening coefficients are about 52% bigger than the dry air collisional broadening coefficients. The transmission of CO2 perturbed by dry and wet air(2.0 kPa water vapor) at the pressure of 0.1