Positron attachment to the He doubly excited states

Bromley, M. W. J., Mitroy, J. and Varga, K. (2012) Positron attachment to the He doubly excited states. Physical Review Letters, 109 6: 063201.1-063201.5. doi:10.1103/PhysRevLett.109.063201

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Author Bromley, M. W. J.
Mitroy, J.
Varga, K.
Title Positron attachment to the He doubly excited states
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2012-08
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.109.063201
Open Access Status File (Publisher version)
Volume 109
Issue 6
Start page 063201.1
End page 063201.5
Total pages 5
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2013
Language eng
Formatted abstract
The projection method is used to demonstrate the existence of positron attachment to three doubly excited states of helium. The e+He(2s2  1Se)degā”, e+He(3s2  1Se), and the e+He(2s2p  3Po) states have binding energies of 0.447, 0.256, and 0.486 eV, respectively. These energies were computed with the stochastic variational method and the configuration interaction method. These states will exist as resonances in the e+-He continuum, and the e+He(2s2  1Se) state could be detectable in the e++He collision spectrum. A resonance width of 0.068 eV was computed for the e+He(2s2  1Se) state by using the complex rotation method. The existence of a series of e+He(ns2  1Se) resonances associated with the He(ns2) double Rydberg series is also predicted, and an explicit calculation demonstrating the existence of the e+He(3s2  1Se) state is reported.
Keyword Auto-ionization states
Autoionizing states
Variational method
Resonance states
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
 
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