Journal
PHYSICAL REVIEW A
Volume 87, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.030502
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Funding
- NCN Grant [2011/01/B/ST4/00733]
- Poznan Supercomputing and Networking Center
- PL-Grid Infrastructure
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High-precision results are reported for the energy levels of the 2(1)S and 2(1)P states of the beryllium atom. Calculations are performed using fully correlated Gaussian basis sets and taking into account the relativistic, quantum electrodynamics (QED), and finite nuclear mass effects. Theoretical predictions for the ionization potential of the beryllium ground state 75 192.699(7) cm(-1) and the 2(1)P -> 2(1)S transition energy 42565.441(11) cm(-1) are compared to known but less accurate experimental values. The accuracy of the four-electron computations approaches that achieved for the three-electron atoms, which enables determination of the nuclear charge radii and precision tests of QED. DOI: 10.1103/PhysRevA.87.030502
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