LASER-INDUCED FLUORESCENCE MEASUREMENTS OF RADIATIVE LIFETIMES OF THEBIBR A(3)PI(O-STATE())

Fluorescence lifetimes for emission from specific (v',J') rovibrationa l levels of the BiBr A(3) Pi(0(+)) state have been measured by the fir st time by laser-induced fluorescence. Collision-free lifetimes for va rious rovibrational levels (v',J') of BiBr A(3) Pi(0(+)) state have be en obtained. No significative variations were found for different rota tional transitions in the v'=0-3 interval of vibrational levels of the A(3) Pi(0(+)) state studied. A collision-free fluorescence radiative lifetime of tau(0) approximate to 0.54 mu s is proposed for the BiBr A (0(+)) state and values for total deactivation rates of k(T) approxima te to (6.2 +/- 0.4) x 10(-12) cm(3)molec(-1)s(-1) in the spectral rang e studied were obtained.