MULTIELECTRON RESPONSE TO INTENSE LASER FIELDS

In this paper we will describe recent theoretical approaches to calcul ating the response of multielectronic atoms in intense laser fields. T his work is based on the soultion of the time-dependent Schrodinger eq uation for a single atom driven by a linearly polarized laser field. R esults obtained in recent experimental measurements of multiple ioniza tion rates suggest that the interaction between the electrons in heliu m enhances the double ionization rate. Solving the full two-electron S chrodinger equation is a very computer-intensive problem, and therefor e we have introduced a new model that can reproduce the experimental r esults. This model is described in detail in this paper, and used to i nvestigate the origin of the double ionization.