Abstract
The nuclear liquid drop model is applied to describe some basic properties ofa negative hydrogen ion in the strong electric field of a laser. Theequilibrium ionic size, energy and polarizability of the ion are calculated. Collectivemodes of the dipole oscillations are considered. A barrier which arises ina strong electric field is studied. The barrier vanishes at some large valueof the electric field, which is defined as a critical value. The dependenceof thecritical field on frequency is studied. At frequencies ω⩾(ωd/21/2)(ωd is the frequency of the dipole oscillations of theelectroniccloudrelative to the nucleus) the barrier remains for any field. At highfrequenciesa `stripping' mechanism for instability arises. At the resonant frequencya rather low amplitude of the electric field causes the `stripping'instability.
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