Author Institution: Department of Chemistry, State University of New YorkFluorescence of NO2β excited by He-Cd 442 nm laser radiation is found to exhibit a spectrum characteristic of perpendicular transitions from several levels belonging to the 2B1β vibronic state with Kβ²>0. The lifetimes of these levels are substantially greater than those given previously for Kβ² = 0 levels of the 2B1β state. The present results support the mechanism of lifetime lengthening by the Renner interaction of the 2B1β and 2A1β components of the linear 2Ξ uβ