Abstract
In a recent paper1 we reported the achievement of coherent phase control of the competition between ionization and dissociation of hydrogen iodide molecules. Control was achieved by absorption of three photons of frequency ω1 and one photon of frequency ω3 = 3ω1, at energies just above the first ionization threshold. The detected products were HI+ and I+, the latter generated by dissociation of the molecule and the absorption of one or more photons by the fragment iodine atoms. Increasing the relative phase of the two lasers produced a modulation of the two ion signals. It was further observed that at certain wavelengths the modulated signals were out of phase with each other, so that the branching ratio was also modulated.
© 1997 Optical Society of America
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