TY - JOUR
T1 - Excited states of positronic lithium and beryllium
AU - Bubin, Sergiy
AU - Prezhdo, Oleg V.
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/11/4
Y1 - 2013/11/4
N2 - Using a variational method with an explicitly correlated Gaussian basis, we study the e+-Li and e+-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 Po4 and 1s22s2p Po3 for e+-Li and e+-Be, respectively. The result is particularly notable for the e+-Be complex, as the excited Po3 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.
AB - Using a variational method with an explicitly correlated Gaussian basis, we study the e+-Li and e+-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 Po4 and 1s22s2p Po3 for e+-Li and e+-Be, respectively. The result is particularly notable for the e+-Be complex, as the excited Po3 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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U2 - 10.1103/PhysRevLett.111.193401
DO - 10.1103/PhysRevLett.111.193401
M3 - Article
AN - SCOPUS:84887064025
VL - 111
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 19
M1 - 193401
ER -