THEORY OF MULTIPHOTON IONIZATION AND AUTOIONIZATION OF SI

We present a theory and calculations of 3-photon ionization and autoio nization of the silicon atom. We have employed a configuration interac tion Hartree-Fock-Dirac method (CIHFD) in order to calculate energies and wavefunctions. The continuum wavefunctions have been obtained nume rically and matched to Coulomb functions in the asymptotic region. Our results include energies of bound and autoionizing levels, dipole tra nsition matrix elements, ionization and autoionization transition rate s, obtained on the basis of perturbation theory.