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Predissociation of the b3Πg(v=9) State of He2 Excimer
Chuan-liang Li1, Chuan-liang Li1, Jun-li Zhang1, Xiao-hua Yang1,2, Yang-qin Chen*1
1.State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal Univer-sity, Shanghai 200062, China;2.School of Science, Nantong University, Nantong 226007, China
Abstract:
The predissociation of the v=9 level in the b3Πg state by the c3g+ state of helium eximer(He2) was studied based on the newly observed (9, 3) band in the b3Πg-a3u+ system inthe region of 12065~12445 cm-1 employing optical heterodyne-concentration modulation absorption spectroscopy. With the help of the previous potential energy curves and molecular constants of He2, the corresponding predissociation mechanism for the b3Πg (v=9) state was analyzed. An RKR potential energy curve of b3Πg and an ab initio potential curve of c3g+ were used to calculate the predissociation linewidths that show basic agreement withobservations, which can quantitatively explain the experiments.
Key words:  Helium eximer, Predissociation, Concentration modulation absorption spec-troscopy
FundProject:
He2分子 b3Πg(v=9)态的预解离
李传亮1, 邓伦华1, 张俊丽1, 杨晓华1,2, 陈扬骎*1
1.华东师范大学精密光谱科学与技术国家重点实验室,物理系,上海200062;2.南通大学理学院,南通226007
摘要:
利用光外差-浓度调制吸收光谱技术测量了b3Πg~a3u+(9,3)带在12065~12445 cm-1的光谱,并研究了He2分子b3Πg(v=9)态与c3g+ 态的预解离相互作用.基于He2分子c3g+ 态的ab initio理论计算势能曲线和b3Πg态的RKR势能曲线,分析了b3Πg(v=9)态的预解离机制,并计算了b3Πg(v=9)态转动能级的预解离线宽,计算结果同实验测量基本一致.
关键词:  He准分子,预解离,浓度调制光谱
DOI:10.1088/1674-0068/24/02/125-128
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