INNER-SHELL PHOTOIONIZATION OF ALKALINE-EARTH-METAL ATOMS

The photoionization cross sections, branching ratios, and angular-dist ribution asymmetry parameters for the inner shells of alkaline-earth-m etal atoms have been calculated using the relativistic random-phase ap proximation and the relativistic random-phase approximation modified t o include relaxation effects. Our main purpose is to determine whether relaxation effects are important throughout the group IIA of alkaline -earth metals. Comparisons are made between relaxed and unrelaxed resu lts. Results for beryllium and strontium are compared with experiments . Strong relaxation effects are noted for the ionization of 3d electro ns in barium.