Abstract
We report a theoretical approach based on a combination of jj-coupled eigenchannel R-matrix and multichannel quantum-defect (MQDT) methods suitable to determine Raman couplings, dynamical Stark shifts and threshold-resolved ionization rates in heavy alkaline-earth atoms. These atomic parameters are needed to analyze the partial photoelectron spectra and the ionization dynamics of multiphoton processes in a perturbative treatment of the field-atom interaction to the lowest non-vanishing order of perturbation theory. Numerical results are presented in barium, pertaining to the experimental level scheme used by Wang, Chen and Elliott [Phys. Rev. Lett. 77, 2416 (1996)] to study coherent control through two-color interfering paths. Particular emphasis is given on the comparison of length and velocity formulations for the electric dipole operator.
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