1s2s2p2p35S5transition in B ii

An experimental and theoretical study has been made of the 1s2s2$p^2$ ${\mathrm{}}^5$P–1s2$p^3$ ${\mathrm{}}^5$S transition in B i i. The experimental wavelength and lifetime (1323.92±0.07 Å and 0.65±0.01 ns), determined by beam-foil spectroscopy, are more than five times more accurate than previous experimental results. Our theoretical data, from multiconfiguration Hartree-Fock calculations, 1311.6 Å and 0.601 ns, are in excellent agreement with previous theoretical predictions of Beck and Nicolaides [Phys. Lett. 61A, 227 (1977)]. We have also observed the 1s2$p^3$ ${\mathrm{}}^5$S–1s2$p^2$3s ${\mathrm{}}^5$P transition, at 857.7±0.2 Å, in accord with the theoretical value 859.1 Å.