Stabilization of bound state decay in an intense monochromatic high-frequency field

The formalism of complex quasienergies is used for exact calculation of the field-dependent decay rate for a weakly bound particle (in the model of a three-dimensional zero-range potential) in a strong monochromatic laser fie ld. It is shown that the adiabatic (quasistationary) stabilization regime i n this model occurs at frequencies omega exceeding the binding energy and o nly in a limited intensity range. A simple estimate is obtained for the cri tical field of stabilization breakdown. The effect may be observed for the decay of H- ions in the field of a neodymium laser of femtosecond duration. (C) 2000 MAIK "Nauka / Interperiodica".