Collision-induced dissociation of laser-excited Br2[ B 3Π(0+ u ); v ′, J ′]: Formation of Br*(2 P 1/2)+Br(2 P 3/2) at energies 1–5 k T below dissociation

Absolute rate constants are measured for the dissociation of initially excited Br2[B 3Π(0+u);v′,J′] into Br*(2P1/2)+Br(2P3/2) fragments by thermal energy collisions with Br2(X 1Σ+g), Xe, and Ar at 297 K. A 0.04 cm−1 étalon-narrowed pulsed dye laser populates specific rovibrational levels of isotopic Br2 which are 1–5 kT below the B-state dissociation limit; in addition the laser directly photodissociates molecules which are in thermally excited …