TwoElectron Systems in a Weak Laser Field.
Abstract
In this dissertation, we present a method to represent the wavefunction of atoms or ions with 2 active electrons interacting with a radiation field. We use a basis formed by the products of oneelectron complex Sturmian functions and spherical harmonics. We design a numerically stable algorithm to compute to very high accuracy the electron electron interaction term (the most difficult term to compute in this basis). This method is an extremely powerful tool and can be applied to the solution of a large variety of problems involving the interaction of twoelectron systems with a laser field. We apply this method to obtain rates for twoand threephoton ionization (detachment) of H ^ and helium leaving the remaining ion (atom) in the ground state. Simultaneously, we study excessphoton ionization (detachment) for the two previous atomic systems. These rates were calculated for a weak laser field such that we could use a perturbative scheme. We also present a method for the systematic treatment of double photoionization of twoelectron atomic systems. We apply this method. We calculate the energy and angular distributions for the double ionization of He by one photon, over the range of photon energies 89140 eV. Our results compare favorably with experimental data. (Copies available exclusively from Micrographics Department, Doheny Library, USC, Los Angeles, CA 900890182.).
 Publication:

Ph.D. Thesis
 Pub Date:
 1993
 Bibcode:
 1993PhDT.......129P
 Keywords:

 Physics: Atomic