Theoretical study on decay processes of the core-excited states in BII

Wavefunctions, energies, radiative decay possibilities and non-radiative (Auger) decay rates of the core-excited 1s(2l) ⁿ(2l') ^m(n+m=3) states in BII are calculated using relativistic Multiconfiguration Dirac-Fock method. We found that electron correlations effects are very important for energies and radiative decay rates of core-excited states in BII and that both the valence-valence and core-valence electron correlations need to be considered in the calculations. Auger decay rates of quintuplet 1s2p ^{3 5}S ₂ states and 1s2s2p ^{2 5}P ₁, ⁵P ₂, ⁵P ₃ states are much smaller compared to these of other states, which implies that these states are more stable than the other states in this work. Our results provide theoretical supports to further experimental researches.