Table 3: The hyperfine structure parameters (in a.u.) and coupling constants (in MHz) of the state for the beryllium atom.

Method Reference

LC MBPTa9.2319−0.064900.30478−0.1156−124.21[5, 6]
HF + SDCIb9.2738−0.066560.30014−0.1097−124.76−139.77[7]
FE MCHFc9.2349−0.065640.30261−0.1150[8]
MCHF9.2416−0.065870.30329−0.11570−124.50−139.35[9]
This work9.2436−0.065230.30201−0.11588−124.51−139.36
Experiment−124.5368−139.373[10]

aLinked-cluster many-body perturbation theory.
bHartree-Fock and CI allowing all SD excitations to correlation orbitals of Slater type.
cFinite-element multiconfiguration Hartree-Fock.