Oxidation state of platinum in oxidative-addition reactions and .eta.1-iodine products from dihalogen reactions with organoplatinum(II) complexes, as inferred from monochromatic x-ray photoelectron spectroscopy

1992 ◽  
Vol 31 (12) ◽  
pp. 2655-2658 ◽  
Author(s):  
J. C. Muijsers ◽  
J. W. Niemantsverdriet ◽  
I. C. M. Wehman-Ooyevaar ◽  
D. M. Grove ◽  
G. Van Koten
Keyword(s):  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Oxidative Addition ◽  
Addition Reactions ◽  
X Ray

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.

Oxidation state of mercury and lead in Hg0.66Pb0.34Ba2Ca2Cu3O8+δ studied by X-ray photoelectron spectroscopy

1997 ◽  
Vol 282-287 ◽  
pp. 967-968
Author(s):  
H.M. Shao ◽  
C.C. Lam ◽  
X.S. Wu ◽  
L.W. Shao ◽  
X.X. Yao
Keyword(s):  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
X Ray

Oxidation state of mercury inHgBa2(Ca0.86Sr0.14)2Cu3O8+δstudied by x-ray photoelectron spectroscopy

1995 ◽  
Vol 52 (14) ◽  
pp. R9879-R9881 ◽  
Author(s):  
C. S. Gopinath ◽  
Nam H. Hur ◽  
S. Subramanian
Keyword(s):  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
X Ray

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.

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