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.