Relativistic and QED Corrections for the Beryllium Atom
- 25 May 2004
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 92 (21) , 213001
- https://doi.org/10.1103/physrevlett.92.213001
Abstract
Complete relativistic and quantum electrodynamics corrections of order alpha(2) Ry and alpha(3) Ry are calculated for the ground state of the beryllium atom and its positive ion. A basis set of correlated Gaussian functions is used, with exponents optimized against nonrelativistic binding energies. The results for Bethe logarithms ln(k(0)(Be)=5.750 34(3) and ln(k(0)(Be+)=5.751 67(3) demonstrate the availability of high precision theoretical predictions for energy levels of the beryllium atom and light ions. Our recommended value of the ionization potential 75 192.514(80) cm(-1) agrees with equally accurate available experimental values.Keywords
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