Photoemission study of praseodymia in its highest oxidation state: The necessity of in situ plasma treatment

A. Schaefer, S. Gevers, V. Zielasek, T. Schroeder, J. Falta, J. Wollschläger, M. Bäumer
2011 Journal of Chemical Physics  
A cold radio frequency oxygen plasma treatment is demonstrated as a successful route to prepare clean, well-ordered, and stoichiometric PrO 2 layers on silicon. High structural quality of these layers is shown by x-ray diffraction. So far unobserved spectral characteristics in Pr 3d x-ray photoelectron (XP) spectra of PrO 2 are presented as a fingerprint for praseodymia in its highest oxidized state. They provide insight in the electronic ground state and the special role of praseodymia among
more » ... e rare earth oxides. They also reveal that former XP studies suffered from a significant reduction at the surface.
doi:10.1063/1.3516953 pmid:21303146 fatcat:iukwdzmpovd2fc2wqhgqkqqkfu