Artykuły naukowe (WCh)
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Browsing Artykuły naukowe (WCh) by Subject "Bethe logarithms"
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Item Relativistic and QED Corrections for the Beryllium Atom(American Physical Society, 2004) Pachucki, Krzysztof; Komasa, JacekComplete relativistic and quantum electrodynamics corrections of order α2 Ry and α3 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 lnk0(Be)=5.750 34(3) and lnk0(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.