Charge transfer in transition metal carbides and related compounds studied by ESCA

Thermal desorption of dimethyl methylphosphonate from MoO3

“…Above 423 K, a significant amount of methyl groups remain on the surface, most likely as PCH x , similar to what was observed in previous studies of DMMP on CeO 2 [21]. The presence of Mo-CH x species is unlikely because Mo-C species have much lower binding energies, around the range of 282.7 eV [24] to 283.2 eV [25]. A small amount of methoxy lingers, though it is unclear if this peak is from surface methoxy groups or methoxy-P species.…”

Electron Energy Loss Near Edge Structure (ELNES) on the Carbon K-Edge in Transition Metal Carbides with the Rock Salt Structure

“…Table II compares the threshold values found in this work with those given by Pflüger et al [2,4] and the binding energies of Ramqvist et al [5] as quoted in reference [6]. It is clear that there is some variation in the values obtained and that there is no systematic trend in the differences.…”

“…In general, the spectral shapes are in good agreement. The binding energies of the carbon 1s states in these compounds relative to that of carbon in hydrocarbon contamination have also been determined by Ramqvist et al [5] using the technique of electron spectroscopy for chemical analysis (ESCA) (also known as X-ray photo-electron spectroscopy (XPS)). Their results have been converted into binding energies relative to the Fermi level and are quoted in reference [6].…”

Room-Temperature Ferromagnetism in Carbon-Doped ZnO

“…Our Raman spectroscopic study confirmed the presence of graphite. New carbon species with C1s binding energy between 280 and 284 eV observed in the C-doped ZnO films suggests presence of carbon atoms in the carbide form, [35] which is an indication of carbon substitution for oxygen and formation of Zn-C bonds in the carbon doped ZnO films.…”