Frequency-dependent stabilization of He- by a superintense laser field

Using the alternative representation of time-dependent Hamiltonians that describe laser-driven systems, we have performed calculations for the stability of He- in a superintense linearly polarized laser field. We estimated the laser parameters, amplitude, and frequency needed to stabilize He-. If we choose the laser frequency ω=5eV, the laser intensity needed for stabilization is Icritical =9.0× 1015 W cm2 and the maximal detachment energy is 1.0 eV. Our results show that high frequencies and large intensities are preferred for stabilizing multiply negative atomic ions in superintense laser fields.