Excited States of Positronic Lithium and Beryllium
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Date
2013
Authors
Bubin, Sergiy
Prezhdo, Oleg V.
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Abstract
Using a variational method with an explicitly correlated Gaussian basis, we study the eþ-Li and eþ-Be
complexes in the ground and lowest excited states with higher spin multiplicity. Our calculations provide
rigorous theoretical confirmation that a positron can be attached to the excited states: 1s2s2p 4Po and
1s22s2p 3Po for eþ-Li and eþ-Be, respectively. The result is particularly notable for the eþ-Be complex,
as the excited 3Po state lies below the autoionization threshold. We report accurate binding energies,
annihilation rates and structural properties of these positron-atom systems. The existence of the ground
and metastable excited states with bound positron opens up a new route to the presently lacking
experimental verification of stability of a positron binding to any neutral atom
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Keywords
Research Subject Categories::NATURAL SCIENCES::Physics, Positronic Lithium, Beryllium
Citation
Sergiy Bubin, Oleg V. Prezhdo; 2013; Excited States of Positronic Lithium and Beryllium; PHYSICAL REVIEW LETTERS