EFFECT OF RESONANCES ON THE COHERENT CONTROL OF THE PHOTOIONIZATION AND PHOTODISSOCIATION OF HI AND DI

The phase lag between the ionization and dissociation products of HI a nd DI molecules obtained by one- and three-photon excitation was measu red as a function of excitation energy in the vicinity of a molecular resonance. The phase lag was observed to have an asymmetric profile wi th a deep minimum near the center of the resonance. A strong isotope e ffect was also observed. A theoretical analysis, using projection oper ators to partition the Lippmann-Schwinger equation, showed that a mole cular phase is responsible for the energy dependence of the phase lag.