APPEARANCE INTENSITIES FOR MULTIPLY-CHARGED IONS IN A STRONG LASER FIELD

We study multiple ionization of atoms by a strong laser field using a time-dependent approach based on the Thomas-Fermi model. The evolution of the electron density under the influence of a transient, linearly polarized radiation field is determined by numerical solution of hydro dynamic equations on a two-dimensional grid. We find a threshold ''app earance intensity'' for a given charge state, i.e., the laser intensit y at which such a charge state first appears, which is in reasonable a greement with experimental results for high charge states.