Abstract
The purpose of this paper is to present recent theoretical attempts to explain consistently various core level spectra in an insulator CeCO2 and to compare obtained electronic configuration and various interaction strengths with those for metallic Ce compounds. High energy spectroscopy such as x-ray photoemission (XPS) and x-ray photoabsorption (XAS) is well known to be a powerful means for studying electronic structures of rare earth systems [1]. In La and its compounds, a core XPS often exhibits a satellite in addition to a main peak [2]. KOTANI and TOYOZAWA explained the satellite structure by introducing the core hole attractive potential acting on f electrons -Ufc on the basis of the spinless Anderson model [3].
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