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)
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
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.
Received: 13 March 2009
Revised: 10 April 2009
Accepted manuscript online:
PACS:
32.80.Rm
(Multiphoton ionization and excitation to highly excited states)
(Calculations and mathematical techniques in atomic and molecular physics)
Fund: 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).
Cite this article:
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) Scaled-energy spectroscopy of a |M| = 1 Rydberg barium atom in an electric field 2009 Chin. Phys. B 18 4791
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