Low- and intermediate-energy photoionisation of palladium

The results of calculations of the atomic photoionisation cross sections, angular distribution asymmetry parameters, branching ratios and spin polarisation parameters for the 4d, 4p, 4s, 3d and 3p subshells of palladium are reported. Calculations have been performed for a photon energy range of about 0.34-28.0 au. The positions of the Cooper minima in the 4d and 4p photoionisation cross sections are located in the continuum. Also, the study shows the 4s and 3p Cooper minima to be in the discrete part of the spectrum. The centrifugal barrier faced by the continuum f electrons causes a 'shape resonance' in the 4d and 3d cross sections and also affects the branching ratio for the sigma (nd5/2): sigma (nd3/2) cross sections. The branching ratio in the 4d cross section is influenced by the fact that the Cooper minima in the individual relativistic dipole, 4d5/2,3/2 to in f7/2,3/2 channels occur at different photon energies. Threshold effects and dynamical factors such as the occurrence of Cooper minima have a marked effect on the energy dependence of the spin polarisation parameters.