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Transition energies and probabilities in high-spin states of the boron sequence and an electron affinity for negative beryllium

In the present work we study the 1s2s2p3 6So → 1s2s2p23s 6 Pe and 1s2s2p3 6So → 1s2s2p23d 6Pe transitions energies and probabilities in the boron isoelectronic sequence, including B I, C II, N III, O IV, F V, Mg IX and A1 IX. Extending the calculations to Be-, we also confirm the bound character of the excited 1s2s2p3 6So state and predict the electron affinity EA = 1.29783 eV for Be(1s2s2p2 5 P). The calculations are carried out using a semirelativistic multiconfiguration Hartree-Fock method and the transition properties are analyzed mainly in the light of correlation effects. The present results are compared with recent experimental studies, indicating an overall good agreement for the transition energies, but a larger discrepancy for the transition probabilities.