Schneider C W, Kucerovsky Z, Brannen E
Appl Opt. 1989 Mar 1;28(5):959-66. doi: 10.1364/AO.28.000959.
A laser resonance absorption spectrometer is used to investigate the characteristics of both self and nitrogen collision broadened carbon dioxide in resonance with He-Ne laser radiation at 4.2 microm. The absorption coefficient in these broadening conditions has contributions from the R(28) to R(34) absorption lines of the nu(3) CO(2) spectrum. The Fletcher-Powell optimization method is used to reduce the raw absorption data and to find the best value average collision broadening coefficient and laser emission frequency for a Lorentzian line shape model of the contributing lines. Pure carbon dioxide absorption in a pressure range of from 0.0016 atm (1.25 Torr) to 0.33 atm (250 Torr) is described well by the model with an average self broadening coefficient of 0.084 +/- 0.008 cm(-1) atm(-1) for laser frequencies located at either 2370.591 +/- 0.020 cm(-1) or 2371.135 +/- 0.019 cm(-1). Nitrogen broadened carbon dioxide in the total pressure range of from 0.13 atm (100 Torr) to 1.18 atm (900 Torr) is characterized by the same model with the laser frequency at 2371.102 +/- 0.007 cm(-1) atm(-1). The average absorption coefficient for low concentrations of carbon dioxide in a 1-atm total pressure nitrogen environment has been determined experimentally as 9.90 +/- 1.49 cm(-1) atm(-1). All the listed results are at 296 K.
一台激光共振吸收光谱仪用于研究在4.2微米波长处与氦氖激光辐射共振的二氧化碳的自碰撞加宽和氮碰撞加宽特性。在这些加宽条件下，吸收系数来自于ν(3) CO(2)光谱中从R(28)到R(34)的吸收线。使用弗莱彻-鲍威尔优化方法来处理原始吸收数据，并为贡献谱线的洛伦兹线型模型找到最佳值平均碰撞加宽系数和激光发射频率。对于位于2370.591±0.020厘米-1或2371.135±0.019厘米-1的激光频率，该模型能很好地描述0.0016大气压（1.25托）至0.33大气压（250托）压力范围内纯二氧化碳的吸收情况，其平均自加宽系数为0.084±0.008厘米-1大气压-1。对于总压力范围从0.13大气压（100托）至1.18大气压（900托）的氮加宽二氧化碳，该模型以激光频率2371.102±0.007厘米-1大气压-1为特征。在1大气压总压力的氮气环境中，低浓度二氧化碳的平均吸收系数经实验测定为9.90±1.49厘米-1大气压-1。所有列出的结果均在296K温度下。
