Abstract

We have developed an elaborate theoretical and computational approach for the study of strong field phenomena in two-electron atoms taking into account the electron-electron correlation in the dynamics of the process. The work grew in three stages. In the first stage, we developed the essentials of the approach which consists of a discretized L²-basis of atomic states constructed in terms of B-splines. These are completely correlated two-electron states in terms of which we expand the time-dependent wavefunction satisfying the Schrödinger equation which includes the interaction with the time-dependent laser field represented by a realistic pulse shape. Recently published results[1, 2] include ATI and photoelectron angular distributions in He which showed very small correlation effects as evaluated through a comparison with frozen core or single-active-electron calculations which are conveniently performed using the same technique.

© 1997 Optical Society of America