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)†
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
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 1s21S0 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.
Received: 15 November 2008
Revised: 05 December 2008
Accepted manuscript online:
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(万建杰) and Dong Chen-Zhong(董晨钟) Doubly excited 2s2p 1,3P1 resonances in photoionization of helium 2009 Chin. Phys. B 18 3819
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