Study on terahertz spectra of SO_2 and H_2S  

作　　者：CAI He WANG Dong SHEN JingLing 

机构地区：[1]Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz, Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University [2]Beijing Institute of Environment Features

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第4期685-690,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Science and Technology Program of Beijing Educational Committee (Grant No. KM200910028005);the Natural Science Foundation of Beijing (Grant No. 4102016)

摘　　要：The spectral characteristics of air pollution gas sulfur dioxide and hydrogen sulfide has been studied experimentally and theo-retically in the range of 0.2-2.6 THz. The gases absorption spectra of sulfur dioxide and hydrogen sulfide, as measured by terahertz Time-Domain Spectroscopy (THz-TDS) technique, show equi-spaced absorption peaks. The peak intervals are varied for different gas and may relate with the molecule structures and rotation modes. We have calculated the intervals of rotational transition frequency according to the gases molecule structure and the rotational modes. The results are consistent with experimental results which confirm the suggestion that the absorption is coming from the molecular rotational transition. The study suggests a technique to detect air pollutants by THz-TDS and the rotational modes of gas molecules.The spectral characteristics of air pollution gas sulfur dioxide and hydrogen sulfide has been studied experimentally and theo-retically in the range of 0.2–2.6 THz. The gases absorption spectra of sulfur dioxide and hydrogen sulfide, as measured by terahertz Time-Domain Spectroscopy （THz-TDS） technique, show equi-spaced absorption peaks. The peak intervals are varied for different gas and may relate with the molecule structures and rotation modes. We have calculated the intervals of rotational transition frequency according to the gases molecule structure and the rotational modes. The results are consistent with experimental results which confirm the suggestion that the absorption is coming from the molecular rotational transition. The study suggests a technique to detect air pollutants by THz-TDS and the rotational modes of gas molecules.

关 键 词：SPECTROSCOPY terahertz wave rotational mode gas molecule 

分 类 号：TN21[电子电信—物理电子学] O433[机械工程—光学工程]