Classical simulations for atoms and molecules in intense laser fields

The one-dimensional classical model (based on phase-space averaging method) of multielectron atoms and molecules in intense laser pulse was investigat ed. For hydrogen atoms, we studied the influence of changing the smoothing parameter on the final ionization probability. In multielectron atoms, we f ound the existence of appearance intensities. For a sufficiently strong las er field, we obtained the Coulomb explosion of the hydrogen molecule and th e kinetic energy defect.