| speaker: | Friedrich Reinert Fachrichtung 7.2 - Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany |
| time: | We. 02.04.03, 9:00 - 10:00 |
Already in the early days of photoelectron spectroscopy, this technique was applied for the investigation of the electronic states of lanthanide compounds. Since then, a huge amount of studies on the core-levels and valence band states has been accumulated and the results have significantly contributed to the understanding of the unusual properties caused by the many-body interaction between the f-states and conduction electrons. Cerium and Ytterbium compounds represent the spectroscopically simplest model systems because of their simple initial state configuration with one electron (f1) or one hole (f13) in the f-shell, respectively. This talk shall give a tutorial introduction to the principles of photoemission and its application to Ce and Yb compounds. It includes the spectroscopy of the core states by XPS (x-ray photoelectron spectroscopy) and the states close to the Fermi level (UPS: ultra violet photoelectron spectroscopy). In this context, particular problems related to the surface sensitivity of the method are discussed.