Determination of the oxidation state of manganese in lepidolite by X-ray photoelectron spectroscopy

Clay Minerals ◽  
1982 ◽  
Vol 17 (4) ◽  
pp. 477-481 ◽  
Author(s):  
S. Evans ◽  
E. Raftery
Keyword(s):  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Electronic Spectroscopy ◽  
Binding Energies ◽  
Core Electron ◽  
X Ray ◽  
Occasional Occurrence ◽  
The Subject ◽  
Electron Binding Energies

It is usually assumed that the oxidation state of the small proportion of Mn sometimes present in micas is +2, although there is evidence from electronic spectroscopy (Burns, 1970) for at least the occasional occurrence of Mn(III) in manganophyllite. We describe here X-ray photoelectron spectroscopic (XPS) measurements on the Mn in a Norwegian lepidolite which was the subject of a concurrent structural study by X-ray photoelectron diffraction (Evans & Raftery, 1982). To establish the Mn oxidation state we have compared the Mn2p core-electron binding energies (BE), the Mn2P3/2-O ls BE differences, and the Mn2p XPS peak profiles from the four common oxides of manganese (MnO, Mn3O4, Mn2O3 and MnO2) with those from the lepidolite. A re-examination of these oxides was undertaken because the agreement between reports in the literature was unsatisfactory, and uncertainty existed concerning the integrity of some of the surfaces previously examined.

A study of the core electron binding energies of ozone by x-ray photoelectron spectroscopy and the Xα scattered wave method

1977 ◽  
Vol 49 (2) ◽  
pp. 213-217 ◽  
Author(s):  
M.Salim Banna ◽  
David C. Frost ◽  
Charles A. McDowell ◽  
Louis Noodleman ◽  
Barry Wallbank
Keyword(s):  
Photoelectron Spectroscopy ◽  
Scattered Wave ◽  
Binding Energies ◽  
Wave Method ◽  
Core Electron ◽  
X Ray ◽  
The Core ◽  
Electron Binding Energies ◽  
Electron Binding

X-ray photoelectron spectroscopy of Cu–In–Se–N and Cu–In–Se thin films

1992 ◽  
Vol 7 (8) ◽  
pp. 1984-1986 ◽  
Author(s):  
Shigemi Kohiki ◽  
Mikihiko Nishitani ◽  
Takayuki Negami ◽  
Takahiro Wada
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Binding Energies ◽  
Core Electron ◽  
X Ray ◽  
The Core ◽  
Bonding Interaction ◽  
Electron Binding Energies ◽  
Electron Binding

The Cu, In, and Se core-level electron binding energies of the p-type Cu–In–Se–N thin film were larger than those of the n-type Cu–In–Se thin film. The positive shift of the core-electron binding energies for the Cu–In–Se–N film is consistent with that expected from the conduction types of the films. Holes were positioned in the Cu–Se antibonding orbitals of the Cu–In–Se–N film. The analysis using the Auger parameter revealed that the Cu–Se bonding interaction is stronger for the Cu–In–Se–N film than for the Cu–In–Se film.

X-ray photoelectron spectroscopic (XPS) studies of iodine oxocompounds

1988 ◽  
Vol 53 (3) ◽  
pp. 425-432 ◽  
Author(s):  
Zdeněk Bastl ◽  
Heidrun Gehlmann
Keyword(s):  
Cross Sections ◽  
Chemical Shifts ◽  
Theoretical Data ◽  
Binding Energies ◽  
Oxidation States ◽  
Core Electron ◽  
X Ray ◽  
The Core ◽  
Quantitative Surface Analysis ◽  
Electron Binding Energies

The core electron binding energies of eighteen compounds containing iodine in different oxidation states ranging from (-I) to (VII) have been measured. The observed chemical shifts differ from the literature data. The anticipated existence of hexavalent iodine in certain compounds has not been demonstrated. The relative subshell photoemission intensities of iodine have been determined. Empirically derived atomic sensitivity factors and theoretical photoionization cross-sections have been used to calculate the surface stoichiometry. The concentration ratios obtained via the two methods are compared. In agreement with generally accepted view the results of this comparison imply that, for quantitative surface analysis, empirical values should be used rather than theoretical data.

XPS and XRD Studies of Samples from the Natural Fission Reactors in the Oklo Uranium Deposits

1993 ◽  
Vol 333 ◽  
Author(s):  
S. Sunder ◽  
N.H. Miller ◽  
A.M. Duclos
Keyword(s):  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Xrd Analysis ◽  
Binding Energies ◽  
Uranium Deposits ◽  
Xps Spectra ◽  
X Ray ◽  
Two Samples ◽  
Reactor Zone ◽  
Fission Reactors

ABSTRACTMineral samples from the natural fission reactors 10 and 13 in the Oklo uranium deposits were studied using X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) to gain information about the long-term behaviour of UO2 fuel in a geological disposal vault. Two samples from reactor zone 10 (samples # D81N-190292 and D73-88) and one sample from reactor zone 13 (sample # SD37-S2/CD) were analysed. Low-resolution XPS spectra were recorded to determine the major elements present in the ore. High-resolution spectra were recorded to gain information about the chemical state of the elements present in the mineral samples. The samples show low values for the U6+/U4+ ratio. The oxidation state of uranium in these samples is even lower than that in U409. The binding energies of the Pb 4f bands indicate most of the Pb is in the +2 oxidation state in these samples. The C Is band indicates the presence of organic carbon. XRD analysis shows that the main uranium-bearing phase is uraninite and lead is present mainly as galena. The significance of the results for nuclear fuel waste management is discussed.

Characterization of Oxidized Nickel (II) Dimethylglyoxime Using X-Ray Photoelectron Spectroscopy

1987 ◽  
Vol 41 (6) ◽  
pp. 994-1000 ◽  
Author(s):  
V. Y. Young ◽  
F. C. Chang ◽  
K. L. Cheng
Keyword(s):  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Binding Energies ◽  
Core Level ◽  
Solution Phase ◽  
Intensity Data ◽  
X Ray ◽  
Complex Core

X-ray photoelectron spectroscopy has been used to determine the oxidation state of nickel in the oxidized nickel (II) dimethylglyoxime complex. Core level binding energies for the Ni(2p), N(1s), and O(1s) levels; the presence or absence of shake-up satellites on the Ni(2p) levels; and the analysis of intensity data are consistent only with an assignment of +3. Structures consistent with the data are proposed for both the solid-and the solution-phase complexes.

Determination of the Oxidation State of the 99Tc Technetium Isotope on Activated Carbon by X-Ray Photoelectron Spectroscopy

2021 ◽  
Vol 57 (9) ◽  
pp. 893-900
Author(s):  
Yu. A. Teterin ◽  
A. V. Makarov ◽  
A. V. Safonov ◽  
E. V. Zakharova ◽  
K. I. Maslakov ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
X Ray
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