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Chin. Phys. B, 2009, Vol. 18(9): 03819    DOI: 10.1088/1674-1056/18/9/034

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

Wan Jian-Jiea, Dong Chen-Zhongb
a College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China; b 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
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 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.
Keywords:  MCDF method      Fano parameter      doubly excited state      interference      photoionization  
Received:  15 November 2008      Revised:  05 December 2008      Published:  20 September 2009
PACS:  32.80.Fb (Photoionization of atoms and ions)  
  31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)  
  32.80.Hd (Auger effect)  
  32.80.Zb (Autoionization)  
Fund: 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).

Cite this article: 

Wan Jian-Jie, Dong Chen-Zhong Doubly excited 2s2p 1,3P1 resonances in photoionization of helium 2009 Chin. Phys. B 18 03819

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