光谱学与光谱分析, 2011, 31 (12): 3180, 网络出版: 2012-01-05
6 038~6 052 cm-1附近CH4低温吸收光谱研究
Study of CH4 Spectroscopy at Low Temperature Near 1.65 μm
可调谐半导体激光吸收光谱 低温谱线 谱线强度 低能级能量 Tunable diode laser absorption spectroscopy Low temperature spectrum Line intensity Low stated energy
摘要
在CH4吸收光谱测量中, 特别是低温吸收光谱测量中, 分子吸收谱线的准确性测量十分重要, 尤其是将所得的测量参数运用到地球大气以及外星球的遥感探测和模拟。 HITRAN数据库中CH4给出的参数并不完整, 同时还很不准确。 为了对6 038~6 052 cm-1波段的CH4低温吸收光谱进行测量, 该文采用窄线宽的二极管激光器作为光源, 结合自主设计的低温装置, 测量了CH4的低能级能量和转动量子数, 并与HITRAN 2008进行了对比, 同时模拟了线强随温度的变化。
Abstract
In the CH4 absorption spectroscopy measurement, especially the measurements at low temperature, the accurate values of the absorption spectral parameters are very important. The absorption spectral parameters are especially important when the authors use parameters to sense and model the atmospheres of the earth and the outer planets. Sometimes the CH4 parameters listed in the HITRAN 2008 database are uncertain to some extent. In order to measure the low temperature absorption spectroscopy of methane, the authors used a cryogenic cell newly developed by ourselves in combination with a distributed feedback (DFB) diode laser as the light source and measured the low stated energy and the rotational angular momentum. And while the authors compared our data with HITRAN 2008, the authors modeled the line intensity changing with the temperature. The authors’ measured parameters will be helpful for sensing and modelling the atmospheres of the earth and the outer planets.
高伟, 王贵师中国科学院安徽光学精密机械研究所大气光学研究中心, 安徽 合肥230031, 陈卫东, 张为俊中国科学院安徽光学精密机械研究所大气光学研究中心, 安徽 合肥230031, 高晓明. 6 038~6 052 cm-1附近CH4低温吸收光谱研究[J]. 光谱学与光谱分析, 2011, 31(12): 3180. GAO Wei, WANG Gui-shi, CHEN Wei-dong, ZHANG Wei-jun, GAO Xiao-ming. Study of CH4 Spectroscopy at Low Temperature Near 1.65 μm[J]. Spectroscopy and Spectral Analysis, 2011, 31(12): 3180.