Doubly excited 2s2p ^(1,3)P_1 resonances in photoionization of helium  

作　　者：万建杰 董晨钟 

机构地区：[1]College of Physics and Electronic Engineering,Northwest Normal University [2]Joint Laboratory of Atomic and Molecular Physics,NWNU & IMP CAS

出　　处：《Chinese Physics B》2009年第9期3819-3827,共9页中国物理B（英文版）

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);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)

摘　　要：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.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.

关 键 词：MCDF method doubly excited state PHOTOIONIZATION Fano parameter INTERFERENCE 

分 类 号：O562.4[理学—原子与分子物理]