Abstract
Resonant inverse photoemission spectroscopy (RIPES) measurements have been performed in the soft X-ray (SX) region. The energy region, which could not be accessible up to these days, includes core levels of many important elements to be investigated. They were applied to transition metals (TM), rare earth (RE) metals, and their compounds. Remarkable resonance enhancement was observed in Ce 4d→4f resonance of some Ce compounds. This gives us complementary information with Ce 3d resonance IPES that was reported before. 2p and 3p resonance spectra were observed for the TM compounds. These resonances show rather weak enhancement compared with those of Ce compounds, although apparent resonance feature was observed. These results are well-reproduced by many-body configuration interaction on the basis of the Anderson impurity model. Though the study has just started, the results demonstrated the effectiveness of the RIPES measurements.
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