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Excited, bound and resonant positron-atom systems

Bromley, Michael W. J. and Mitroy, Jim (2010). Excited, bound and resonant positron-atom systems. In: XV International workshop on Low Energy Positron and Positronium Physics, York University, Toronto,Canada, 29 July - 1 August 2009.

Document type: Conference Paper

IRMA ID 81704288xPUB13
Author Bromley, Michael W. J.
Mitroy, Jim
Title Excited, bound and resonant positron-atom systems
Conference Name XV International workshop on Low Energy Positron and Positronium Physics
Conference Location York University, Toronto,Canada
Conference Dates 29 July - 1 August 2009
Conference Publication Title Journal of Physics: Conference Series
Place of Publication United Kingdom
Publisher Institute of Physics Publishing (IOP Publishing)
Publication Year 2010
Volume Number 199
ISSN 1742-6588   (check CDU catalogue open catalogue search in new window)
Start Page 12011
End Page 12016
Total Pages 5
HERDC Category E1 - Conference Publication (DIISR)
Abstract Calculations have demonstrated that eleven neutral atoms can bind positrons, while many more can bind positronium. This is a short review of recent progress made in understanding some of the underlying mechanisms. The emphasis here being on configuration interaction calculations with excited state configurations. These have demonstrated the existence of a2P o excited state of e+Ca, which consists predominantly of a positronium cluster orbiting the Ca+ ion in the L 1 partial wave. Preliminary results are presented of excited state positron binding to a model alkali atom, where the excited 1Po states are stable over a limited region. Implications for the unnatural parity, 2,4S o, states of PsH, LiPs, NaPs and KPs are also discussed. The e +Mg, e+Cu, e+Zn and e+Cd systems show a lack of a 2Po excited state, each instead possessing a low-energy p-wave shape resonance of varying strength.
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Created: Fri, 17 Jan 2014, 00:09:12 CST