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Collisional Line Assignments and Hyperfine Structure Interpretation in Cs2 231g State
Dan Li,Feng Xie*,Li Li,Ergin H. Ahmed,A. Marjatta Lyyra
Author NameAffiliationE-mail
Dan Li Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China  
Feng Xie* Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China fxie@mail.tsinghua.edu.cn 
Li Li Department of Physics, Tsinghua University, Beijing 100084, China  
Ergin H. Ahmed Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-6082, USA  
A. Marjatta Lyyra Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-6082, USA  
Abstract:
Accurately known energy level structure of the Cs2 A1+u -b3Πu complex of states from a recent global de-perturbation of these states has enabled additional assignments of 140 per-turbation facilitated infrared-infrared double resonance (PFIIDR) transitions to the 231g state from collisionally populated intermediate A1+u levels. Together with the 221 previ-ously observed 231g←A1+u← X1+g double resonance lines [J. Chem. Phys. 128, 204313 (2008)], molecular constants and the Rydberg-Klein-Rees potential energy curve of the 231g state have been recalculated (excluding 54 perturbed levels). The centrifugal distortion con-stant has been determined and agrees well with the value calculated based on standard empirical formulas. The hyperfine structure of the 231g state, which has not resolved in our sub-Doppler excitation spectra of the 231g state, has been interpreted with a preliminary simulation.
Key words:  Cs2, 231g state, Collision-induced energy transfer, Hyperfine structure
FundProject:
Cs2 231g态碰撞线归属和超精细结构解释
李丹,谢锋*,李丽,Ergin H. Ahmed,A. Marjatta Lyyra
摘要:
根据最新的Cs2分子中间态A1+u -b3Πu全局解微扰获得的能级数据, 归属了通过微扰增强红外-红外光学双共振中间态A1+u 到上态231g的140条碰撞线, 包含之前实验观测到的221条231g←A1+u← X1+g 双共振跃迁[J. Chem. Phys. 128, 204313 (2008)], 重新计算了231g态的分子常数和势能曲线(排除54个微扰能级). 本次拟合得到的离心畸变常数和从经验公式计算得到的值相符合. 在亚多普勒激发光谱中,没有分辨出231g态的超精细结构. 对231g态的超精细结构进行初步计算,比较实验结果给出解释和说明.
关键词:  Cs2,231g电子态,碰撞诱导能量转移,超精细结构
DOI:10.1063/1674-0068/26/01/13-19
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