摘要
采用高灵敏的激光光腔衰荡光谱技术研究了CO2对160水分子v^2+3v^3振动带跃迁线的压力诱导效应.为了抑制水的自碰撞效应,水的压力在实验中低于0.5Torr.基于铷原子吸收线和超稳法布里-珀罗标准确定了跃迁谱线高达10^-5cm^-1精度的绝对频率.采用软碰撞模型对吸收线进行模拟,获得了对应的线形参数.
Carbon dioxide pressure-broadened ro-vibrational transitions belonging to thev^2+3v^3 band of H2160 have been measured with a sensitive cavity ring-down spectrometer. Water vapor of relatively low pressures (〈0.5 Torr) was used to limit the self-collisions among water molecules. After the calibration using the precise atomic transitions of Rb and a thermo- stabilized Fabry-Perot interferometer, 10^-5 cm^-1 frequency accuracy has been achieved. Line parameters are derived from least-squares fitting of the spectra using the "soft" collision model. The retrieved line parameters can be applied in the study of water absorption in the CO2-rich atmospheres of planets like Venus and Mars.
基金
ACKNOWLEDGMENTS This work is supported by the National Natural Science Foundation (No.21225314 and No.20903085), the National Basic Research Program of China (No.2013CB834602) and the Fundamental Research Funds for the Central Universities.
关键词
水
二氧化碳
压力诱导加宽
压力诱导位移
光腔衰荡光谱
Water, Carbon Dioxide, Pressure-induced half width, Pressure-induced line shift, Cavity ring-down spectroscopy