Vacancies in the L1 shell of atoms and molecules can decay non-radiatively via Coster-Kronig decay whereby the vacancy is filled by an electron from the L2,3 shell while a second electron is emitted into the ionization continuum. This process is akin to Auger decay, but in contrast to Auger electrons, Coster-Kronig electrons have rather low kinetic...
The gap state that appears upon reduction of TiO2 plays a key role in many of titania's interesting properties but its origin and spatial localization have remained unclear. In the present work, the TiO2(110) surface is reduced in a chemically controlled way by sodium adsorption. By means of resonant photoelectron diffraction, excess electrons are ...
Electronic structures of R3S4 (R=La, Ce) has been investigated by using photoemission spectroscopy (PES) and electronic structure calculations performed in the LSDA and the LSDA+U method. The valence-band spectrum of La3S4 reveals that the electronic states near E-F have mainly La 5d character, in agreement with the LSDA calculation. The Ce 4f PES ...
The electronic structure of La0.7Ce0.3MnO3 (LCeMO) has been investigated by using photoemission spectroscopy. A very weak 4f resonance is observed and the Ce 3d spectrum of LCeMO is very similar to that of CeO2, indicating that Ce ions are far from being trivalent. The Mn 2p con-level spectrum of LCeMO is essentially the same as that of hole-doped ...
Oxidation behavior of stainless steel surface was investigated at 450 degreesC in oxygen partial pressure of 1 x 10(-9) Torr using surface-sensitive photoemission spectroscopy (PES). At the initial stage of oxidation, a layer mixed with metallic chromium and oxygen existed on top of Cr2O3 layer, showing relatively high oxygen concentration compared...
Oxidation of stainless was performed at 450 degrees C and oxygen partial pressures of 10(-9)-10(-4) Torr. Atomic force microscopy (AFM) images and surface-sensitive photoemission spectroscopy spectra clearly show that, at 450 degrees C, oxygen pressures lower than the critical pressure (p(c)(l)=similar to 1 x 10(-8) Torr) favor the formation of a s...
We report the ultrahigh-vacuum preparation of a Cr2O3 film on a stainless-steel surface with marked sorption resistance. The thermal desorption spectra clearly show the water-repellent nature of the oxide film, which is almost total Cr2O3 as indicated by the surface-sensitive photoemission spectrum. The film promises extreme high vacuum, and could ...
The electronic structure of single crystalline CeNiSn has been investigated using photoemission spectroscopy. The extracted Ce 4f spectrum exhibits three peak structures; the typical Fermi level and 2 eV peaks, and another between them, similar to 0.9 eV below the Fermi level E-F. The near-E-F peak reflects a substantial Ce 4f-Sn sp hybridization, ...
