摘要
利用光外差-浓度调制吸收光谱技术测量了b^3Пg-^
3∑u^＋（9，3）带在12065-12445cm-1的光谱，并研究了He2分了b^3Пg（v=9）态与c3∑g^＋态的预解离相互作用．基于He2分了c3∑g^＋态的ab initio理论计算势能曲线和b^3Пg态的RKR势能曲线，分析了b^3Пg（v=9）态的预解离机制，并计算了b^3Пg（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．
The predissociation of the v=9 level in the b^3Пg state by the 3∑u^＋ state of helium eximer （He2） was studied based on the newly observed （9, 3） band in the b^3Пg （v=9） system in the 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 b^3Пg （v=9） state was analyzed. An RKR potential energy curve of b^3Пg and an ab initio potential curve of 3∑g^＋ were used to calculate the predissociation linewidths that show basic agreement with observations, which can quantitatively explain the experiments.
基金
Acknowledgments： This work is supported by the National Natural Science Foundation of China （No.11034002 and No.11004062）, the National Key Basic Research and Development Program of China （No.2010CB922903 and No.2011CB21602）, and the Basic Key Program of Shanghai Municipality （No.07JC14017）. Chuan-liang Li is grateful to the support of the PhD Program Scholarship Fund of the East China Normal University 2009. The authors thank Pro- fessor Robert J. LeRoy from University of Waterloo for providing his BCONT, RKR and LEVEL programs,and authors are also particularly grateful to Dr. Xing- can Dai from JI-LA and NIST for his helpful and useful suggestions and discussions in simulation.
关键词
He准分了
预解离
浓度调制光谱
Helium eximer, Predissociation, Concentration modulation absorption spectroscopy
