Abstract
Phase‐shift lifetime measurements over a range of modulation frequency have provided data on the effects of the weak predissociation of the A 2Σ+ state. The υ′ = 0 radiative lifetime (850 ± 130 nsec) corresponds to an f(0–0) of 7.7 ± 1.1 × 10−4 in agreement with previous absorption measurements. The higher vibrational quanta show shortened radiative lifetimes due to predissociation.