An X-ray Photoelectron (ESCA) and Laser Raman Spectroscopic Investigation of Aluminum Perrhenate

1980 ◽  
Vol 34 (6) ◽  
pp. 624-626 ◽  
Author(s):  
Lawrence Salvati ◽  
Gerald L. Jones ◽  
David M. Hercules
Keyword(s):  
Raman Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Heterogeneous Catalysts ◽  
Laser Raman Spectroscopy ◽  
Compound Formation ◽  
Reduction Behavior ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Significant Interest

Compound formation in supported heterogeneous catalysts is an area of significant interest. In the present study, Al(ReO4)3 was prepared and characterized by x-ray photoelectron spectroscopy and laser Raman spectroscopy. Characteristic spectra for Al(ReO4)3 are shown and compared to several rhenium reference compounds. The reduction behavior of Al(ReO4)3 is also explored; it was completely reduced to elemental rhenium in H2 at 500°C.

scholarly journals Characterization of Metal/Carbon Multilayers by Raman Spectroscopy

1989 ◽  
Vol 160 ◽  
Author(s):  
David D. Allred ◽  
Qi Wang ◽  
Jesus Gonzalez-Hernandez
Keyword(s):  
Raman Spectroscopy ◽  
Amorphous Semiconductor ◽  
Laser Raman Spectroscopy ◽  
Plasma Confinement ◽  
Ray Optics ◽  
X Ray ◽  
Laser Raman ◽  
Line Shapes ◽  
Two Peaks

AbstractLaser Raman spectroscopy has been found to be useful for characterizing amorphous semiconductor multilayers, especially the interfaces of multilayers. Recently, we have extended this technique to the characterization of magnetron sputtered multilayers commonly used as reflectors in soft x-ray optics. Unlike the multilayers previously studied which contained only semiconductors and dielectrics, these are generally semiconductor/metal multilayers. We report here on the Raman characterization of the most common class of multilayers used in soft x-ray optics, those that contain a high density metal like tungsten interspersed with layers of carbon. In all of the metal/carbon multilayers the dominate feature in the Raman spectra is due to a-C. The a-C spectra consists of a broad peak at about 1560 cm-1 (G-peak) and a shoulder at about 1400 cm-1 (D-peak). This can be deconvoluted with Gaussian line shapes to yield two peaks (one at about 1560 to 1570 cm-1 and the other at about 1380 to 1420 cm-1). Among the W/C multilayer samples peak positions and relative magnitudes changed little with carbon thickness over the range of 1 to 12 nm. Significant differences are, however, seen as the identity of the metal component is altered or, especially, as the preparations are varied. For example, the intensity ratio of the D-peak to G-peak was much larger for multilayer samples prepared under conditions of good plasma confinement.

scholarly journals Raman spectroscopic study of photosensitive damage to lysozyme structure sensitized by hypocrellin A

2006 ◽  
Vol 20 (5-6) ◽  
pp. 269-273 ◽  
Author(s):  
J. H. Zhou ◽  
X. H. Wu ◽  
S. H. Wei ◽  
X. T. Gu ◽  
Y. Y. Feng ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Main Chain ◽  
Molecular Level ◽  
Active Oxygen ◽  
Laser Raman Spectroscopy ◽  
Side Chain ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Raman Spectroscopic Study ◽  
Hypocrellin A

Laser Raman spectroscopy was used to detect the nature of the structural change in lysozyme sensitized by hypocrellin A (HA) at the molecular level. The results indicated that the orderly structure of lysozyme has been damaged by the active oxygen (1O2, O2−·and.OH, etc.) generated by HA, and cause the changes in H-bonds system of the main chain and the side chain of lysozyme.

Photo- and Thermo-Chromic Study of the Ethylenediamine Trimolybdate

2008 ◽  
Vol 47-50 ◽  
pp. 1193-1196
Author(s):  
De Hui Sun ◽  
Hong Jie Zhang ◽  
Ji Lin Zhang ◽  
Jiang Bo Yu
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Powder Diffraction ◽  
Color Difference ◽  
Laser Raman Spectroscopy ◽  
X Ray ◽  
Laser Raman ◽  
Thermochromic Properties ◽  
The Difference

The ethylenediamine trimolybdate (ENTMo) can show unusually photochromic and thermochromic properties and there exists in the difference of chromic mechanisms, which has been proved in our previous work [1]. In this paper, X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and laser Raman spectroscopy (LRS) of the colored samples are characterized and analyzed in detail. The crystal structure, the inorganic skeleton and the microenvironment of center ions of the colored samples do not substantively change except distortion. The color difference of the photochromic and the thermochromic samples is discussed and that the difference of reduction sites result in their different chromic mechanisms is suggested.

Redox Reactions of Iron and Uranium Dioxide in Simulated Cement Pore Water Under Anoxic Conditions

2002 ◽  
Vol 757 ◽  
Author(s):  
Daqing Cui ◽  
Kastriot Spahiu ◽  
Paul Wersin
Keyword(s):  
Photoelectron Spectroscopy ◽  
Redox Reactions ◽  
Pore Fluid ◽  
Laser Raman Spectroscopy ◽  
X Ray Diffraction ◽  
Exchange Reactions ◽  
Anoxic Conditions ◽  
X Ray ◽  
Laser Raman ◽  
Corrosion Of Iron

Results on the chemical behavior of Fe(0) and UO2(s), as well as the interaction between fresh and corroded iron with U(VI) in simulated cement contacting alkaline solution are reported. Batch experiments were conducted under anoxic conditions at different alkalinities and salt concentrations to investigate: (a) the corrosion of iron foils (b) the U(VI) removal by fresh, aged and pre-treated (with FeS or Fe3O4 layers) iron surfaces in a simulated cement pore fluid, (c) the dissolution rates of newly reduced UO2.00 slices in simulated cement pore fluid and KOH solutions (pH 12.7) and (d) the isotope exchange reactions between dissolved 235U(VI) and 238UO2(s). The reacted iron and UO2(s) surfaces were analyzed by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectra (SEM-EDS), laser Raman spectroscopy and X-ray photoelectron, spectroscopy (XPS).

X-ray powder diffraction data for a new compound (NH4)H2Co2O(OH)(MoO4)1.6(WO4)0.4•H2O type ϕy

2018 ◽  
Vol 33 (4) ◽  
pp. 315-318 ◽  
Author(s):  
Adriana Echavarría ◽  
Sandra L. Amaya
Keyword(s):  
Raman Spectroscopy ◽  
Lamellar Structure ◽  
Laser Raman Spectroscopy ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
Hexagonal Symmetry ◽  
X Ray ◽  
Laser Raman ◽  
Ir Laser ◽  
Ft Ir

A new trimetallic compound with formula (NH4)H2Co2O(OH)(MoO4)1.6(WO4)0.4•H2O and lamellar structure was prepared by hydrothermal synthesis. The solid was characterized using X-ray diffraction (XRD), thermogravimetric (TGA) and differential thermal (DTA) analyses, Fourier-transform infrared spectroscopy (FT–IR), laser Raman spectroscopy (LRS), and atomic absorption spectroscopy (AA). Crystallographic studies showed that the solid crystallizes with hexagonal symmetry in space group R-3 m with a = 6.0807 and c = 21.7591 Å.

scholarly journals Electrodeposited MnO2-based Capacitive Composite Electrodes for Pb2+ Adsorption

2020 ◽  
Vol 71 (7) ◽  
pp. 284-298
Author(s):  
Tang Chang-Bin ◽  
Niu Hao ◽  
Lu Yu-Xuan ◽  
Wang Fei ◽  
Zhang Yu-Jie ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Removal Rate ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
Laser Raman Spectroscopy ◽  
Order Kinetic ◽  
Composite Electrodes ◽  
X Ray ◽  
Laser Raman ◽  
Low Concentrations

In order to effectively realize the removal of low concentrations of lead ions in wastewater via capacitive deionization technology, MnO2 composite electrodes were prepared by a galvanostatic co-deposition approach, where polyaniline (PANI) and graphene were added to an MnO2 deposition solution and nickel foam was chosen as the substrate of the electrode. The microstructure, capacitance characteristics and adsorption behavior of Pb2+ ions of the electrodes were analyzed by scanning electron microscopy, X-ray diffraction, X ray photoelectron spectroscopy, laser Raman spectroscopy, cyclic voltammetry and capacitance deionization processes. The experimental results showed that the MnO2-PANI-graphene composite electrode has a high specific capacitance (132.8 F/g) and a 61.8% removal rate for simulated wastewater containing 20 mg/L Pb2 + ions under the conditions of 30�C and 1 mA/cm2, with the addition of 1 g/L PANI and 3 g/L graphene, respectively. Electroadsorption process was in accordance with the Lagergren quasi-second-order kinetic equation. The co-deposition of PANI and graphene oxide could play obvious role in enhancing the adsorption capacity and stability of the electrodes.

Raman Spectroscopic Identification of Bilirubin-Type Gallstone

1986 ◽  
Vol 40 (8) ◽  
pp. 1099-1103 ◽  
Author(s):  
Siding Zheng ◽  
Anthony T. Tu
Keyword(s):  
Raman Spectroscopy ◽  
Laser Raman Spectroscopy ◽  
Characteristic Line ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Stretching Vibration ◽  
Ion Laser ◽  
Spectroscopic Identification ◽  
Spectral Patterns ◽  
Argon Ion

A gallstone from Egypt was examined by laser Raman spectroscopy and identified to be a bilirubin-type stone. The surface of the stone, the subsurface interior, and the center of the stone were irradiated with the 514.5-nm argon-ion laser line. Spectra from the three areas gave similar Raman spectral patterns. Moreover, Raman spectra from the interior of the gallstone were identical to that of bilirubin standard. However, the examination of a Raman spectrum from the outer surface of the stone indicated that it contained cholesterol in addition to bilirubin. Bilirubin has the characteristic line of C=C stretching vibration at 1615 cm−1. Cholesterol has the characteristic line of C(5)=C(6) stretching vibration at 1674 cm−1. Cholesterol also has a strong characteristic line at 1439 cm−1. Therefore, it is quite easy to identify the constituents of gallstone by Raman spectroscopy.

The structure of surface rhenium oxide on alumina from laser raman spectroscopy and x-ray absorption near-edge spectroscopy

1988 ◽  
Vol 46 (1-3) ◽  
pp. 15-36 ◽  
Author(s):  
Franklin D. Hardcastle ◽  
Israel E. Wachs ◽  
John A. Horsley ◽  
Grayson H. Via
Keyword(s):  
Raman Spectroscopy ◽  
Laser Raman Spectroscopy ◽  
Rhenium Oxide ◽  
X Ray ◽  
Laser Raman ◽  
X Ray Absorption
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