CO2对790nm附近水线的压力加宽和位移

CO2 Pressure Shift and Broadening of Water Lines Near 790 nm

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.