Adiabatic theory of electron detachment from negative ions in a two-color laser field

Abstract

Negative-ion detachment in a bichromatic laser field is considered within the adiabatic theory. The latter represents a recent modification of the famous Keldysh model for multiphoton ionization (L. V. Keldysh, Zh. \'Eksp. Teor. Fiz. 47, 1945 (1964) [Sov. Phys. JETP 20, 1307 (1965)]) that makes it quantitatively reliable. We calculate angular differential detachment rates, partial rates for particular above-threshold detachment channels, and total detachment rates for the ${\mathrm{H}}^{\ensuremath{-}}$ ion in a bichromatic field with a 1:3 frequency ratio and various phase differences. The reliability of the present, extremely simple approach is testified to by comparison with much more elaborate earlier calculations.