中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4791-4796.doi: 10.1088/1674-1056/18/11/031

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

汪磊, 全威, 沈礼, 杨海峰, 史庭云, 柳晓军, 刘红平, 詹明生   

  1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
  • 收稿日期:2009-03-13 修回日期:2009-04-10 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10774162) and the National Key Basic Research Program of China (Grant No 2005CB724501).

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

Wang Lei(汪磊),Quan Wei(全威), Shen Li(沈礼), Yang Hai-Feng(杨海峰), Shi Ting-Yun(史庭云),Liu Xiao-Jun(柳晓军), Liu Hong-Ping(刘红平)†,andZhan Ming-Sheng(詹明生)   

  1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2009-03-13 Revised:2009-04-10 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10774162) and the National Key Basic Research Program of China (Grant No 2005CB724501).

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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.

Abstract: 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: $\varepsilon$ = -2.000, $\varepsilon$ = -2.500 and $\varepsilon$ = -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.

Key words: Stark, Rydberg, barium

中图分类号:  (Multiphoton ionization and excitation to highly excited states)

  • 32.80.Rm
32.60.+i (Zeeman and Stark effects) 31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)