High-resolution electron spectroscopy of a strongly correlated system: Atomic barium - art. no. 062715

High-resolution 4d and 5p photoelectron spectra of free barium atoms were m easured using narrow-bandwidth synchrotron radiation of 131.2 eV photon ene rgy. These measurements were necessary to disentangle the complex structure of the electron spectra. We also performed a Hartree-Fock calculation with relativistic corrections. A very good agreement between theory and experim ent was found, which allowed the assignment of all but the weakest lines, i n addition to pointing out the significant contribution of configuration in teraction and shake processes.