Abstract
We have studied Multi-Photon Ionization (MPI) in Krypton using a field made up of two sub-picosecond laser pulses, one the second harmonic of the other, as a function of phase shift between the two pulses. Recent previous experiments have used either two pulses of incommensurate frequencies, or pulses that were in the "long-pulse" regime1 where ponderomotive effects dominate the final kinetic energies of ejected photoelectrons. The sub-picosecond pulses of this experiment allow us to identify laser induced resonances during the ionization process2 and hence specific ionization pathways. The variation of the total electric field in time and the amplitude of the peak electric field is phase dependent.
© 1992 The Author(s)
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