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Calculations are performed, using a one-dimensional short-range potential and a simple model of the helium atom, of multiphoton ionization due to the coherent superposition of a laser beam with one of its higher-order harmonics. Variation of the relative phase leads to the enhancement or suppression of ionization and to large asymmetries in the photoelectron angular distribution.
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Szöke et al. (1991) studied this question.
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