THE A(0(-X(0(+)) TRANSITION OF BIBR - RADIATIVE LIFETIMES OF THE A-STATE()))

Laser induced fluorescence from resolved rovibrational levels (v', J') of the electronically excited A(0(+)) state of BiBr has been observed . Fluorescence lifetimes for several rovibrational levels (v', J') of the BiBr A(0(+)) state in the v' = 4-9 interval have been measured, an d a study of their variation with pressure has been made. No significa nt variations of radiative lifetimes from specific vibrational levels v' (v' = 0-9) of the BiBr A excited state has been observed, and no de pendence on the rotational energy, within a vibrational level, was det ected for the measured lifetimes. A collision-free radiative lifetime of tau(0) approximate to 0.52 mu s is proposed for the BiBr A(0(+)) st ate and values for quenching rate constants in the order of k(Q) appro ximate to (1.0 +/- 0.3) X 10(-11) cm(3) molecule(-1) s(-1) in the spec tral range studied were obtained. From calculated Franck-Condon factor s for the v'-v '' transitions of the A-X system and from our radiative lifetimes, electronic transition moments have been calculated.