Abstract
Negative-ion detachment in a two-colour laser field is considered within the recent modification of the Keldysh model which makes it quantitatively reliable. The general approach is illustrated by calculation of angular differential detachment rates, partial rates for particular above threshold detachment channels and total detachment rates for the ion in a bichromatic field with a 1:2 frequency ratio. Both perturbative and strong-field regimes are examined. Polar asymmetry and phase effects are quantitatively characterized with some new features revealed.
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