高精密光腔衰荡光谱研究分子碰撞诱导吸收

项目名称： 高精密光腔衰荡光谱研究分子碰撞诱导吸收

项目编号： No.21473172

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 刘安雯

作者单位： 中国科学技术大学

项目金额： 90万元

中文摘要： 一些分子的高精度碰撞诱导吸收值，在地球大气二氧化碳浓度精确定量、恒星成分和年龄确定以及碰撞诱导吸收理论模型的检验等方面，具有重要的意义。利用高信噪比的测量手段，准确测量分子光谱线形是获得高精度碰撞诱导吸收值的有效手段。本项目计划发展高灵敏、高精密的光腔衰荡变温探测技术方法，并结合50mK级的精密控温技术，实现10-5精度的分子光谱谱线线形测量；将分子的谱线线形参数测定至0.5 MHz以下,精确计算单体分子跃迁吸收、谱线混合效应和远翼吸收对分子吸收光谱的贡献，获得高精度的分子碰撞诱导吸收实验值，检验光谱谱线线形和碰撞诱导吸收理论模型，以及应用于天体物理的研究。

中文关键词： 碰撞诱导吸收；精密光谱；光腔衰荡光谱；氢分子；二氧化碳

英文摘要： Precision collision-induced absorption (CIA) of some molecules, are particularly important in the studies to accurately quantify the concentration of carbon dioxide in the Earth's atmosphere, to determine the composition and age of some stars, and to test the CIA theoretical models. An effective way to approach high-accuracy in CIA is to precisely determine the line profiles with experimental methods of very high signal-noise-ratio. The main goal of the present project is as following: Cavity ring-down spectroscopy at various temperatures of high-sensitivity and high-precision will be developed. Combined with a temperature-control system with a precision of 50mK, measurements of line profiles with 10-5 precision will be realized. The line profile parameters with the uncertainty smaller than 0.5 MHz will be established. Precision CIA will be derived by accurately calculate the absorption of active molecule, the weak line-mixing effects and far wing contributions in the whole region. The obtained results will provide a direct examination of the line profile and CIA theoretical model, as well as be used in the astrophysical research.

英文关键词： Collision-Induced Absorption;Precision Spectroscopy;Cavity-Ring Down Spectroscopy;Hydrogen Molecule;Carbon Dioxide