SINGLE-ELECTRON DESCRIPTION OF THE STRONG-FIELD ELECTRON DETACHMENT OF HYDROGEN NEGATIVE ION

The applicability of the single-electron model in describing the electron detachment of the hydrogen negative ion in strong (static or laser) fields is examined. By comparing the values for the lowest state energies and detachment rates obtained using two different short-range model-potentials with the results of recent ab initio calculations using the full two-electron description (Milosevic and Simonovic, 2016), it is found that the singleelectron description is applicable for the field intensities up to few hundred GW/cm2 . This description, therefore, can be used for studying multiphoton processes or the electron detachment via tunneling at these field strengths, but fails in over-the-barrier regime.