The results of a systematic XPS study, under high controlled conditions, of different basic oxides of transition metals, alkali and alkaline-earth metals are presented; the XPS data of some hydroxides and peroxides are also reported. Variations of the O 1s binding energies are analysed and one point of interest is the large
 binding energy scale obtained for O 1s peaks all associated with a ‘‘2−
’’ formal charge. Through extended
 Huckel theory-tight binding (EHT-TB) calculations, attempts are made to rationalize the observed variations.
 The results illustrate
 the significant
 differences
 between real
 charges on oxygen atoms in transition metal and alkaline-earth oxides.

Systematic XPS studies of metal oxides, hydroxides and peroxides

Titanium dioxide (TiO2) doped with sulfur (S) was synthesized by oxidation annealing of titanium disulfide (TiS2). According to the x-ray diffraction patterns, TiS2 turned into anatase TiO2 when annealed at 600 °C. The residual S atoms occupied O-atom sites in TiO2 to form Ti–S bonds. The S doping caused the absorption edge of TiO2 to be shifted into the lower-energy region. Based on the theoretical analyses using ab initio band calculations, mixing of the S 3p states with the valence band was found to contribute to the band gap narrowing.

Band gap narrowing of titanium dioxide by sulfur doping

Bandgap narrowing of titanium dioxide by sulfur doping

N-heterocyclic carbene analogues with low-valent group 13 and group 14 elements: syntheses, structures, and reactivities of a new generation of multitalented ligands.

π-Bonding and the Lone Pair Effect in Multiple Bonds between Heavier Main Group Elements

XPS study of thin films of titanium oxysulfides

For the first time the electronic structure of phosphaethene (CH2=PH), the unstable parent compound in the phosphaalkene series, is deduced from its photoelectron spectrum.

Application of photoelectron spectroscopy to molecular properties. Part 34. Phosphaethene. Synthesis by vacuum gas-solid reaction (VGSR) and characterization by photoelectron spectroscopy

Studies of 1T TiS2 by STM, AFM and XPS: the mechanism of hydrolysis in air

Thin films of molybdenum oxysulphides which could be used as positive electrode materials in microbatteries were analysed by XPS. The results have shown the existence of a new environment for molybdenum with S 2 2- pairs, S 2- and O 2- ions. The evolution of these thin films MoOySz at different stages of their cycle in experimental generators has also been studied; the main elements involved in the redox processes have been characterized: molybdenum atoms with+6 formal oxidation number and disulphide pairs S 2 2-

Geneviève Pfister-Guillouzo

Papers

XPS study of thin films of titanium oxysulfides

Application of photoelectron spectroscopy to molecular properties. Part 34. Phosphaethene. Synthesis by vacuum gas-solid reaction (VGSR) and characterization by photoelectron spectroscopy

Studies of 1T TiS2 by STM, AFM and XPS: the mechanism of hydrolysis in air

XPS analysis of lithium intercalation in thin films of molybdenum oxysulphides

Structure electronique de derives sulfures—III