Transition moment,radiative lifetime,and quantum yield for dissociation of the 3Π0+u state of 81Br2

The electric dipole moment of the B → X transition of ⁸¹Br₂ has been calculated from the measured absorption of single vibration-rotation lines with a YAG laser at 558 nm to be |R_e|² = 0.12 D². The corresponding radiative lifetime is τ_rad = 20 μsec. Fluorescence decay times have been measured, as a function of pressure, with a narrowband, nitrogen pumped, dye laser, for vibrational levels v′ = 16, 19, 23. The quantum yield for predissociation at zero pressure is near unity.