6038～6052cm^(-1)附近CH_4低温吸收光谱研究

Study of CH_4 Spectroscopy at Low Temperature Near 1.65 μm

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 052cm-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。

In the CH4 absorption spectroscopy measurement,especially the measurements at low temperature,the accurate values of the abs orption spectral parameters are very important.The absorption spectral paramete rs are especially important when the authors use parameters to sense and model t he atmospheres of the earth and the outer planets.Sometimes the CH4 parameter s listed in the HITRAN 2008 database are uncertain to some extent.In order to m easure 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 energ y and the rotational angular momentum.And while the authors compared our data w ith HITRA N 2008,the authors modeled the line intensity changing with the temperature.Th e authors＇ measured parameters will be helpful for sensing and modelling the at mospheres of the earth and the outer planets.