Using the collinear beam-laser method, we have measured the spontaneous emission lifetime of the 1s2p${\mathrm{}}^3$${\mathit{P}}_2^{\mathit{o}}$ level in Be III to be 29.1±0.2 ns, in good agreement with many mutually consistent theoretical values. This resolves the discrepancy between theory and the previous experimental value. We also obtain a value of 0.214±0.002 for the multiplet oscillator strength of the 1s2s${\mathrm{}}^3$S→1s2p${\mathrm{}}^3$${\mathit{P}}^{\mathit{o}}$ transition. © 1996 The American Physical Society.

• Received 13 November 1995

DOI:https://doi.org/10.1103/PhysRevA.53.2130