Physical Review Letters
We report spectroscopic results on the 2s2p1P1 state in neutral atomic beryllium-9. The absolute frequency for the center of gravity is determined to be 42 565.4501(13) cm−1, a factor of 130 more precise than the previous experimental measurement. The result is in agreement with and a factor of 8 more precise than the current best theoretical estimate of 42 565.441(11) cm−1, which was calculated including the effects of quantum electrodynamics. Because of the large natural linewidth of the transition, the hyperfine constants were not able to be extracted to high precision.
Atomic spectra, Electronic structure of atoms & molecules, Electronic transitions, Fine & hyperfine structure, Laser spectroscopy
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Cook, E. C.; Vira, Alisha Daya; Livernois, E.; and Williams, William, "Testing Quantum Electrodynamics in the Lowest Singlet State of Neutral Beryllium-9" (2018). Physics: Faculty Publications, Smith College, Northampton, MA.