Radiative Lifetimes of BBr and of Ultraviolet Emissions in Electron‐Beam Excited BBr3 Gas

Abstract

The radiative lifetime of BBr in the $A^1\Pi$ state is determined by the phase‐shift method to be $\text{τ\hspace{0.17em}=\hspace{0.17em}25.6\hspace{0.17em}±\hspace{0.17em}5.0}\mathrm{nsec}$ . Comparison of the experimentally determined electronic transition moments for the $A^1{\mathrm{\Pi \to X}}^1{\Sigma }^{+}$ transitions in BF, BCl, and BBr is made. Phase measurements made in an unidentified emission system, excited in BBr₃ gas and extending from about 2200 to 3700 Å, are also briefly described.