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Application of the Zeeman Effect to the Spectral Assignment of Cl2+ Including Its Isotopics
Wu Ling,Zheng Lijuan,Guo Yingchun,Xu Chunyan,Yang Xiaohua,Liu Yuyan,Chen Yangqin*
1.Key Laboratory of Optical and Magnetic Resonance Spectroscopy, Ministry of Education, Department of Physics, East China Normal University, Shanghai 200062;2.State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Phy
Abstract:
The A2Πu-X2Πg electronic absorption spectrum of the Cl2+ molecular cation in the region between 16820 and 17350 cm-1 was observed by employing optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy. Cl2+ is a paramagnetic molecule; however, the intensities of some spectral lines, belonging to three bands whose origins are near 17282, 17324 and 16913 cm-1, respectively, remain unchanged with in the magnetic field. This indicates that both the upper and lower states have a weak Zeeman effect. The Zeeman contribution is nearly zero for the 2Π1/2 state, while nonvanishing for the 2Π3/2 state. Therefore, this behavior for the spectral assignment of Cl2+, including its isotopics was utilized and the identity of these bands was confirmed as members of the Ω=1/2 component of the electronic transition conveniently and unambiguously. The assigned bands are the (3, 7) band of the Ω=1/2 component of 35Cl+2 and 35Cl37Cl+ and the (2, 7) band of the Ω=1/2 component of 35Cl2+. It extends the range of vibrational assignments considerably in both the ground and the excited state, and leads to the successful rotational analysis. New molecular constants of Cl2+ were obtained from the observed line positions, band by band, using a weighted least squares fitting procedure.
Key words:  Molecular spectroscopy, Cl2+ molecular cation, Zeeman effect
FundProject:
塞曼效应在Cl2+及其同位素分子离子
吴玲1,2,3, 郑利娟1, 郭迎春1, 许春燕1, 杨晓华1, 刘煜炎1, 陈扬骎*1
1.华东师范大学光谱学与波谱学教育部重点实验室物理系,上海,200062;2.中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,武汉,430071;3.中国科学院研究生院,北京,100049
摘要:
利用光外差磁旋转速度调制光谱技术获得了可见光波段(16820~17350 cm-1)Cl2+分子离子的A2Πu-X2Πg电子跃迁吸收光谱.在标识Cl2+及其同位素分子离子谱带的过程中,应用塞曼效应,准确指认了属于Ω=1/2子带系的三个子带.它们分别是35Cl2+和35Cl37Cl+的(3,7)带的Ω=1/2子带以及 35Cl2+的(2,7)带的Ω=1/2子带.其标识结果扩展了Cl2+分子离子的基态和激发态能级的振动标识范围,使各谱带的转动分析得以顺利进行,并获得了新的Cl2+分子常数.
关键词:  分子光谱  Cl2+分子离子  塞曼效应
DOI:10.1088/1674-0068/18/6/883-886
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