The role of 3Π0+ in the photodissociation of BrCl at 235 nm

The photodissociation of BrCl has been investigated at 235 nm using a two-dimensional photofragment ion imaging technique. Three direct dissociation channels were observed with the quantum yields of Phi[Br(P-2(1/2)) + Cl(P-2(3/2))] = 0.58 +/- 0.05, Phi[Br(P-2(3/2)) + Cl(P-2(1/2))]= 0.16 +/- 0.05, and Phi[Br(P-2(3/2)) + Cl(P-2(3/2))]= 0.26 +/- 0.05, and angular distributions were represented by anisotropy parameters, beta = 1.98 +/- 0.05, - 1.04 +/- 0.05, and 1.88 +/- 0.05 respectively. The results indicate that the 2341 (II0+)-I-3 State plays a key role in the dissociation dynamics after absorbing a photon. Based on the results of BrCl and newly found probe lines for Br atoms, the ionization probability ratios of Cl(P-2(3/2) or P-2(1/2)) to Br(P-2(3/2) or P-2(1/2)) were determined. (C) 2000 Elsevier Science B.V. All rights reserved.