Laser control of electronic branching ratios in unimolecular dissociation: Model calculations on Bromine

Abstract

The present study center attention on laser control of electronic diabatic processes. As our model system we choose the laser induced dissociation of Bromine, following resonance transitions from the ground state 1Σg to two interfering electronically excited states 3Χ0+u and 1Χ1u. We show that Landau‐Zener‐type diabatic transitions establish the final product distribution. We discuss the possibility to refine the electronic product distribution by a second, intense laser pulse applied after the crossing of the 3∏+u and 1∏1u states. Based on these results inversion of experimental product distribution data may be used to determine the curve crossing parameters. Simulation of laser controlled dissociation is achieved by FFT (Fast Fourier Transform) propagation of representative wave packets.