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Positron attachment to the He doubly excited states

Bromley, Michael W. J., Mitroy, Jim and Varga, Kalman (2012). Positron attachment to the He doubly excited states. Physical Review Letters,109(6):063201-1-063201-5.

Document type: Journal Article
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IRMA ID 82794376xPUB20
Title Positron attachment to the He doubly excited states
Author Bromley, Michael W. J.
Mitroy, Jim
Varga, Kalman
Journal Name Physical Review Letters
Publication Date 2012
Volume Number 109
Issue Number 6
ISSN 0031-9007   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84864705268
Start Page 063201-1
End Page 063201-5
Total Pages 5
Place of Publication College Park, United States
Publisher American Physical Society
HERDC Category C1 - Journal Article (DIISR)
Abstract The projection method is used to demonstrate the existence of positron attachment to three doubly excited states of helium. The e+He(2s2  Se1)deg⁡, e+He(3s2  Se1), and the e+He(2s2p  Po3) 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  Se1) state could be detectable in the e++He collision spectrum. A resonance width of 0.068 eV was computed for the e+He(2s2  Se1) state by using the complex rotation method. The existence of a series of e+He(ns2  Se1) resonances associated with the He(ns2) double Rydberg series is also predicted, and an explicit calculation demonstrating the existence of the e+He(3s2  Se1) state is reported.

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