(e,2e) coincidence study on the coherence of the 2s2(1S) and 2p2(1D) autoionizing states of He

29th International Conference on Photonic, Electronic, and Atomic Collisions

Paripás, B.^1 ; Palásthy, B.^1 ; Tökési, K.^2

Institute of Physics, University of Miskolc, Miskolc-Egyetemváros

3515, Hungary^1

Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), Debrecen, Hungary^2

关键词: Autoionizing state;    Constant ionic state;    Critical energy;    Ejected electrons;    Electron-impact excitation;    Final state;    Interference effects;    Ionic state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052077/pdf
DOI  :  10.1088/1742-6596/635/5/052077

来源: IOP

【 摘 要 】

The electron impact excitation of the autoionizing states of helium, their subsequent decay into the same He+1s-1final ionic state, and the interference of these processes have been studied. A constant ionic state (e,2e) experiment (CIS) is performed, isolating the final state by keeping the sum of the energies of the scattered- ejected electron pairs constant. The focus of this work is on the exchange interference of the 2s2(1S) and 2p2(1D) autoionizing states of helium. At around the critical energy fast variations were observed in the CIS spectra, which indicates the presence of exchange interference effects.