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Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
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TL;DR: The chemical state, composition and stability in air of monolayers of lead sulfide synthesized in stearic acid LB films at a H2S pressure of 1 Torr were studied mainly by X-ray photoelectron spectroscopy (XPS).
5 citations
TL;DR: In this article, a soft X-ray crystal spectrometer designed for chemical state analysis by PIXE is described, where a windowless, microchannel plate (MCP) electron multiplier combined with a photodiode array is used as a position-sensitive detector for X-rays diffracted by a plane crystal.
Abstract: A soft X-ray crystal spectrometer designed for chemical state analysis by PIXE is described. A windowless, microchannel plate (MCP) electron multiplier combined with a photodiode array was used as a position-sensitive detector for X-rays diffracted by a plane crystal. The spectrometer was tested for Al Kα and Fe L X-ray spectra induced by 15 MeV N2+ ion impact. An energy resolution (FWHM) of 1.5 eV for the 1487 eV Al Kα1, 2 line was obtained for metallic Al, and satellite structures of Al Kα arising from multiply ionized states were well resolved. Fe L X-ray spectra were measured for Fe2O3 and metallic Fe. Chemical effects were clearly recognized in the Fe Lα/Lβ intensity ratio and in the intensity distributions of their multiple vacancy satellites.
5 citations
TL;DR: In this article, electron transfer between two transition metals, MoCl5 and VOx supported on silica, is studied in situ at the gas−solid interface by spectroscopy (electron paramagnetic resonance, diffuse reflectance UV−vis−near-IR, XPS, Raman), electron microscopy, and chemical analysis for a long period of time (∼9000 h).
Abstract: Electron transfer between two transition metals, MoCl5 and VOx supported on silica, is studied in situ at the gas−solid interface by spectroscopy (electron paramagnetic resonance, diffuse reflectance UV−vis−near-IR, XPS, Raman), electron microscopy, and chemical analysis for a long period of time (∼9000 h). Initially, the VOx/SiO2 (VV, 3d0) solid phase is composed of V2O5 crystallites and monomeric tetrahedral vanadyl species grafted onto silica ((⋮SiO)3VO). Upon reaction at 30 °C with gas-phase MoCl5 (MoV, 4d1), the solid undergoes drastic changes in color, which define four stages. Each stage is accompanied by variations in the chemical state of the supported phase. The principal results are as follows. (i) No electron transfer and no reaction takes place between MoCl5 and grafted (⋮SiO)3VO species. (ii) In contrast, V2O5 crystallites undergo both electron transfer from MoV to VV and chemical changes leading to a change in the speciation of V and to the formation of a new and amorphous VIV−O−MoVI−Cl pha...
5 citations
TL;DR: In this article, the relationship between band alignment and chemical states in HfSiON/SiON stacked films on Si substrates was investigated by photoemission spectroscopy and x-ray absorption spectrum analysis.
Abstract: We have investigated the relationship between band alignment and chemical states in HfSiON/SiON stacked films on Si substrates by photoemission spectroscopy and x-ray absorption spectroscopy. Valence-band maxima mainly derived from N 2p states in HfSiON films are closely related to N–Hf bonding configurations. The valence-band offset for a thick HfSiON film is smaller than that for a thin HfSiON film, due to the amount of N–Hf bonding states. Since N–Hf bonding states decrease upon annealing, thickness dependence of valence-band offset can be eliminated. On the other hand, the conduction-band offset does not depend on either the thickness or annealing.
5 citations
TL;DR: The structural and chemical states of the doped Mn atoms imply that they ascribe to the observed ferromagnetism in these diluted magnetic semiconductor nanowires.
Abstract: We report on structural chemical state of doped Mn atoms in single crylstalline Mn doped GaN nanowires by X-ray absorption spectroscopy. Anomalous X-ray scattering and K-edge X-ray absorption fine structure measurement make it clear that Mn atoms substitute the Ga sites and they largely take part in the wurtzite network of host GaN. X-ray absorption and X-ray magnetic circular dichroism spectra at Mn L(2,3)-edges show that doped Mn has local magnetic moment and the electronic configuration of the doped Mn is mainly 3d(5) component. The structural and chemical states of the doped Mn atoms imply that they ascribe to the observed ferromagnetism in these diluted magnetic semiconductor nanowires.
5 citations