(e, 2e) coincidence study on the coherence of the 2s2(1S) and 2p2(1D) autoionizing states of He. (August 2015)

• Record Type: Journal Article
• Authors: Paripás, B; Palásthy, B; Tökési, K
• Is Part Of: Journal of physics. Number 635(2015)
• Publication Date: 2015-08
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/635/5/052077
• Languages: English
• ISSNs: 1742-6588

Abstract

Synopsis: The electron impact excitation of the autoionizing states of helium, their subsequent decay into the same He + 1s -1 final 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 2s 2 ( 1 S) and 2p 2 ( 1 D) 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.