THE ROLE OF LASER-PULSE PHASES IN THE SUBPICOSECOND OPTIMAL INFRARED MULTIPHOTON DISSOCIATION OF HF

In a simulation of the five-pulse, subpicosecond, optimal infrared mul tiphoton dissociation of an HF molecule (M. Kaluza J.T. Muckerman, P. Gross and H. Rabitz, J. Chem. Phys. 100 (1994) 4211), randomizing phas es of an optimal pulse reduced the dissociation yield by nearly a fact or of two. Here we simulate the response of an HF molecule to ten five -laser pulses which lack shot-to-shot phase reproducibility. We optimi ze the timings and carrier frequencies of the five pulses to achieve t he maximal average dissociation yield over the ensemble of shots, and provide an estimate for the yield in an experiment in which phases of the laser pulses are not controllable.