The multi-configuration Dirac-Fock (MCDF) method is implemented to study doubly excited 2s2p 1,3^P1 resonances of the helium atom and the interference between photoionization and photoexcitation autoionization proce...The multi-configuration Dirac-Fock (MCDF) method is implemented to study doubly excited 2s2p 1,3^P1 resonances of the helium atom and the interference between photoionization and photoexcitation autoionization processes. In order to reproduce the totM photoionization sprectra, the excited energies from the ground 1s^2 ^1S0 state to the doubly excited 2s2p 1,3^P1 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 p2 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 3^P1 state.展开更多
基金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)+1 种基金the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20070736001)the Foundation of Northwest Normal University of China (Grant No NWNU-KJCXGC-03-21)
文摘The multi-configuration Dirac-Fock (MCDF) method is implemented to study doubly excited 2s2p 1,3^P1 resonances of the helium atom and the interference between photoionization and photoexcitation autoionization processes. In order to reproduce the totM photoionization sprectra, the excited energies from the ground 1s^2 ^1S0 state to the doubly excited 2s2p 1,3^P1 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 p2 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 3^P1 state.