We report new calculations and measurements of fluorescence properties of the title system, which is important in astrochemical processes. Dispersed fluorescence spectra show extensive (X) over tilde B-2(1) vibrational progressions that depend on the initial (A) over tilde (2)A(1) state. Observed and calculated (0,nu(2)('),0)Sigma lifetimes are in good accord, save for nu(2)(')=4 (bent molecule notation), and calculated (1,nu(2)(')-2,0)Sigma lifetimes are longer than the (0,nu(2)('),0)Sigma ones. The calculated laser-induced fluorescence spectrum is compared with experimental absorption data and with previous calculations, finding that the present treatment underestimates the intensity of the (0,4,0)Sigma band. (C) 2003 American Institute of Physics.