中国物理B ›› 2009, Vol. 18 ›› Issue (9): 3819-3827.doi: 10.1088/1674-1056/18/9/034

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Doubly excited 2s2p 1,3P1 resonances in photoionization of helium

万建杰1, 董晨钟2   

  1. (1)College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China; (2)College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;Joint Laboratory of Atomic and Molecular Physics, NWNU & IMP CAS, Lanzhou 730070, China
  • 收稿日期:2008-11-15 修回日期:2008-12-05 出版日期:2009-09-20 发布日期:2009-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774122 and 10876028), the China/Ireland Science and Technology Collaboration Research Fund (Contract No CI-2004-07), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20070736001) and the Foundation of Northwest Normal University of China (Grant No NWNU-KJCXGC-03-21).

Doubly excited 2s2p 1,3P1 resonances in photoionization of helium

Wan Jian-Jie(万建杰)a) and Dong Chen-Zhong(董晨钟)a)b)†   

  1. a College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China; b Joint Laboratory of Atomic and Molecular Physics, NWNU & IMP CAS, Lanzhou 730070, China
  • Received:2008-11-15 Revised:2008-12-05 Online:2009-09-20 Published:2009-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774122 and 10876028), the China/Ireland Science and Technology Collaboration Research Fund (Contract No CI-2004-07), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20070736001) and the Foundation of Northwest Normal University of China (Grant No NWNU-KJCXGC-03-21).

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摘要： The multi-configuration Dirac--Fock (MCDF) method is implemented to study doubly excited 2s2p 1,3P1 resonances of the helium atom and the interference between photoionization and photoexcitation autoionization processes. In order to reproduce the total photoionization sprectra, the excited energies from the ground 1s2 \1S0 state to the doubly excited 2s2p 1,3P1 states and the relevant Auger decay rates and widths are calculated in detail. Furthermore, the interference profile determined by the so-called Fano parameters q and ρ 2 is also reproduced. Good agreement is found between the present results and other available theoretical and experimental results. This indeed shows a promising way to investigate the Fano resonances in photoionization of atoms within the MCDF scheme, although there are some discrepancies in the present calculations of the 2s2p 3P1 state.

Abstract: The multi-configuration Dirac--Fock (MCDF) method is implemented to study doubly excited 2s2p 1,3P1 resonances of the helium atom and the interference between photoionization and photoexcitation autoionization processes. In order to reproduce the total photoionization sprectra, the excited energies from the ground 1s2  1S0 state to the doubly excited 2s2p 1,3P1 states and the relevant Auger decay rates and widths are calculated in detail. Furthermore, the interference profile determined by the so-called Fano parameters q and $\rho^2$ is also reproduced. Good agreement is found between the present results and other available theoretical and experimental results. This indeed shows a promising way to investigate the Fano resonances in photoionization of atoms within the MCDF scheme, although there are some discrepancies in the present calculations of the 2s2p 3P1 state.

Key words: MCDF method, doubly excited state, photoionization, Fano parameter, interference

中图分类号:  (Photoionization of atoms and ions)

  • 32.80.Fb
31.15.-p (Calculations and mathematical techniques in atomic and molecular physics) 32.80.Hd (Auger effect) 32.80.Zb (Autoionization)