Many-body theory calculations of positron binding to negative ions

Details Many-body theory calculations of positron binding to negative ions Many-body theory calculations of positron binding to negative ions

2010-02-16

arxiv.org/abs/1002.3125v1

International Review of Atomic and Molecular Physics, Volume 1, Number 1, January-June 2010, Pages 73-83

Physics

Atomic Physics

19 pages, 13 figures, submitted to International Review of Atomic and Molecular Physics

Scientific paper

A many-body theory approach developed by the authors [Phys. Rev. A 70, 032720 (2004)] is applied to positron bound states and annihilation rates in atomic systems. Within the formalism, full account of virtual positronium (Ps) formation is made by summing the electron-positron ladder diagram series, thus enabling the theory to include all important many-body correlation effects in the positron problem. Numerical calculations have been performed for positron bound states with the hydrogen and halogen negative ions, also known as Ps hydride and Ps halides. The Ps binding energies of 1.118, 2.718, 2.245, 1.873 and 1.393 eV and annihilation rates of 2.544, 2.482, 1.984, 1.913 and 1.809 ns$^{-1}$, have been obtained for PsH, PsF, PsCl, PsBr and PsI, respectively.

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