Scaled-energy spectroscopy of a |M| = 1 Rydberg barium atom in an electric field  

作　　者：汪磊 全威 沈礼 杨海峰 史庭云 柳晓军 刘红平 詹明生 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2009年第11期4791-4796,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 10774162);the National Key Basic Research Program of China (Grant No 2005CB724501)

摘　　要：We observe strong energy-dependent quantum defects in the scaled-energy Stark spectra for ｜M｜ =1 Rydberg states of barium atoms at three scaled energies：ε=-2.000, ε=-2.500 and ε=-3.000. In an attempt to explain the observations, theoretical calculations of closed orbit theory based on a model potential including core effect are performed for non-hydrogenic atoms. While such a potential has been uniformly successful for alkali atoms with a single valence electron, it fails to match experimental results for barium atoms in the 6snp Rydberg states with two valence electrons. Our study points out that this discrepancy is due to the strong perturbation from the 5d8p state, which voids the simple approximation for constant quantum defects of principle quantum number n.We observe strong energy-dependent quantum defects in the scaled-energy Stark spectra for ｜M｜ =1 Rydberg states of barium atoms at three scaled energies：ε=-2.000, ε=-2.500 and ε=-3.000. In an attempt to explain the observations, theoretical calculations of closed orbit theory based on a model potential including core effect are performed for non-hydrogenic atoms. While such a potential has been uniformly successful for alkali atoms with a single valence electron, it fails to match experimental results for barium atoms in the 6snp Rydberg states with two valence electrons. Our study points out that this discrepancy is due to the strong perturbation from the 5d8p state, which voids the simple approximation for constant quantum defects of principle quantum number n.

关 键 词：STARK RYDBERG BARIUM 

分 类 号：O562[理学—原子与分子物理]