Lowest excitation energy of Be9

Monika Stanke, Dariusz Kȩdziera, Sergiy Bubin, Ludwik Adamowicz

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


Variational calculations employing explicitly correlated Gaussian functions and explicitly including the nuclear motion [i.e., without assuming the Born-Oppenheimer (BO) approximation] have been performed to determine the lowest singlet transition energy in the Be9 atom. The non-BO wave functions were used to calculate the α2 relativistic corrections (α=1/137.035999679). With those corrections and with the α3 and α4 QED corrections determined previously by others, we obtained 54677.35cm-1 for the 3S1→2S1 transition energy. This result falls within the error bracket for the experimental transition of 54677.26(10)cm-1. This is the first time an electronic transition of Be has been calculated from first principles with the experimental accuracy.

Original languageEnglish (US)
Article number043001
JournalPhysical review letters
Issue number4
StatePublished - Jul 24 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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