Experimental Apparatus for Measurement of IR and Raman Spectrum at High Temperatures and Pressures

2006 ◽  
Author(s):  
J. Abe
Keyword(s):  
Raman Spectrum ◽  
High Temperatures ◽  
Experimental Apparatus ◽  
Ir And Raman

scholarly journals Effects of Surface in the IR and Raman Spectrum of Porous Silicon Carbide

2020 ◽  
Vol 840 ◽  
pp. 012009
Author(s):  
R Bermeo ◽  
L. Arellano ◽  
A Trejo ◽  
F Salazar ◽  
M. Calvino ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Raman Spectrum ◽  
Porous Silicon ◽  
Porous Silicon Carbide ◽  
Ir And Raman

Illumination- and Annealing-Induced Changes in the Infrared and Raman Spectra of a-Si:H

2001 ◽  
Vol 664 ◽  
Author(s):  
L.-F. Arsenault ◽  
S. Lebiba ◽  
E. Sacher ◽  
A. Yelon
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Qualitative Agreement ◽  
Raman Signal ◽  
Infrared And Raman Spectra ◽  
Matrix Elements ◽  
Short Term ◽  
Phonon Peak ◽  
Induced Changes ◽  
Ir And Raman

ABSTRACTWe have investigated the changes, produced by light-soaking, in both the IR and Raman responses of the Si-Hn stretching peaks in the 2000-2100 cm−1 range. Our observations of the IR response are in qualitative agreement with those of Kong and co-workers [1]: that is, short-term light soaking produces an increase in the intensity of the signal and a simultaneous shift to lower frequency. In contrast, short-term light soaking decreases the total intensity of the Raman signal in the 2000-2100 cm−1 range, when normalized to the TO phonon peak at about 480 cm−1. In both cases, these modifications are reversed on annealing at 200° C. We suggest that these changes are attributable to alterations in the environments of the Si-Hn bonds, with the resultant transfer of intensity between IR and Raman matrix elements. Details of the evolution of the components of the Raman spectrum in the 2000-2100 cm−1 range are presented, and compared with IR changes in the same range.

Harmonic and anharmonic analysis of the IR and Raman spectrum of macrocyclic dioxopolyamine

2014 ◽  
Vol 1074 ◽  
pp. 384-392
Author(s):  
Yujiao Wang ◽  
Xiaomei Xie ◽  
Huijuan Lu ◽  
Feifei Chen ◽  
Huihong Liu ◽  
...  
Keyword(s):  
Raman Spectrum ◽  
Ir And Raman

Schwingungsspektrum und Kristallstruktur des fünffach-koordinierten cis-Dioxo-dipicolinato-vanadat(V)-Anions / Vibrational Spectrum and Crystal Structure of the cis-Dioxo-dipicolinato-vanadium(V) Anion

1978 ◽  
Vol 33 (3) ◽  
pp. 265-267 ◽  
Author(s):  
Bernhard Nuber ◽  
Johannes Weiss ◽  
Karl Wieghardt
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Vibrational Spectrum ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Trigonal Bipyramid ◽  
Ir And Raman

Abstract cis-Dioxo-dipicolinato-vanadate(V), Crystal Structure, IR, Raman The crystal structure of Cs[V(O)2(dipic)]·H2O (dipic = pyridine-2,6-dicarboxylate) has been determined by single crystal x-ray diffraction analysis. The compound crystallizes in the monoclinic space group P21/a, with cell constants a =737.8(3), 6=1917.5(5), c = 792.9(3) pm, β= 94.87(6)°, and Z = 4. The geometry about vanadium is a distorted trigonal bipyramid containing a cis-dioxo moiety (∢ O-V-O 109.9(3)°, V=O bond lengths 161.0(6) and 161.5(6) pm). Vibrational absorptions νs(V - 0) and νas(V=O) were found at 956 and 947 cm-1 in the IR and Raman spectrum, resp.

Stability, Structural and Electronic Properties of Indium Phosphide Wurtzite-Diamantane Molecules and Nanocrystals: A Density Functional Theory Study

2021 ◽  
Vol 69 ◽  
pp. 1-9
Author(s):  
Hamid A. Fayyadh
Keyword(s):  
Density Functional Theory ◽  
Raman Spectrum ◽  
Force Constant ◽  
Density Functional ◽  
Energy Gap ◽  
Spectroscopic Properties ◽  
Functional Theory ◽  
Bulk Energy ◽  
The Stability ◽  
Ir And Raman

The density functional theory is applied for examining the electronic structure and spectroscopic properties for InP wurtzite molecules and nanocrystals. In this paper we present calculations of the energy gap, bond lengths, IR and Raman spectrum, reduced mass and force constant. The results of the presented work showing that the InP’s energy gap was fluctuated about to experimental bulk energy gap (1.49 eV). Results of spectroscopic properties including IR and Raman spectrum, reduced mass and force constant as a function of frequency were in accordance with the provided experimental results. In addition, the study of the Gibbs free energy proved the stability phase of InP wurtzoids against transition to InP diamondoids structure.

STABLE STRUCTURES AND CHARACTERISTIC VIBRATIONAL SPECTRA OF TinOm(n = 2–4; m = 1–2n) CLUSTERS

2013 ◽  
Vol 12 (01) ◽  
pp. 1250094 ◽  
Author(s):  
HONGBO DU ◽  
YU JIA ◽  
RUI-QIN ZHANG
Keyword(s):  
Density Functional Theory ◽  
Raman Spectrum ◽  
Density Functional ◽  
Structure Property ◽  
Functional Theory ◽  
Experimental Identification ◽  
Structure Property Relationships ◽  
Method Of Density Functional ◽  
Ir And Raman ◽  
Stable Structures

The energetically favorable structures and characteristic infrared (IR) and Raman peaks of Ti n O m(n = 2–4, m ≤ 2n) clusters are obtained in this work using a B3LYP/6-311G(d) method of density functional theory (DFT). The structures with m < 2n compose of Ti atoms of lower numbers of coordination with O atoms, providing many dangling bonds which considerably enhance the reactivity compared with its bulk counterpart. Two- and three-coordinated O atoms present for m/n ≤ 1.5, whereas two- and also single-coordinated O atoms are found for m/n > 1.5. The Ti n O m(n = 2–4, m < 2n) clusters show strong IR peaks in the range of 600–1100 cm-1 and strong Raman peaks in the region of 300–800 cm-1, whereas both the IR and Raman spectrum peaks of the Ti n O m(n = 2–4, m = 2n) clusters are in the region of 700–1100 cm-1. The main Raman peak of the Ti n O m(m ≠ 2n) clusters is at a frequency considerably lower than that of the IR spectrum. Our results can help understand the structure-property relationships of the Ti n O m clusters and provide their characteristic spectroscope features for further experimental identification.

FT-IR and Raman microscopic study at 293 K and 77 K of celestine, SrS04, from the middle triassic limestone (Muschelkalk) in Winterswijk, The Netherlands

2001 ◽  
Vol 80 (2) ◽  
pp. 41-47 ◽  
Author(s):  
J. Theo Kloprogge ◽  
Huada Ruan ◽  
Loc V. Duong ◽  
Ray L. Frost
Keyword(s):  
Absorption Spectrum ◽  
Infrared Spectroscopy ◽  
Raman Spectrum ◽  
The Netherlands ◽  
Middle Triassic ◽  
Infrared Absorption Spectrum ◽  
Raman And Infrared Spectroscopy ◽  
Ft Ir ◽  
A Minor ◽  
Ir And Raman

AbstractThis paper describes the Raman and infrared spectroscopy of SrSO4 or celestine from the Muschelkalk of Winterswijk, The Netherlands. The infrared absorption spectrum is characterised by the SO42-modes V1 at 991 cm-1, v3 at 1201, 1138 and 1091 cm-1, and v4 at 643 and 611 cm-1. An unidentified band is observed at 1248 cm-1. In the Raman spectrum at 293 K the V1 mode is found at 1000 cm-1 and is split in two bands at 1001 and 1003 cm-1 upon cooling to 77 K.The v2 mode, not observed in the infrared spectrum, is observed as a doublet at 460 and 453 cm-1. The v3 mode is represented by four bands in the Raman spectrum at 1187, 1158, 1110 and 1093 cm-1 and the v4 mode as three bands at 656, 638 and 620 cm-1. Cooling to 77 K results in a general decrease in bandwidth and a minor shift in frequencies. A decrease in intensities is observed upon cooling to 77 K due to movement of the Sr atom towards one or more of the oxygen atoms in the sulfate group.

Air Ingress Experiments Within High Temperature Graphite Flow Channels

2016 ◽  
Author(s):  
Dan Gould ◽  
Hitesh Bindra ◽  
Eric Schlaikjer ◽  
Hanwen Liu
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Removal Rate ◽  
Heat Removal ◽  
Temperature Response ◽  
Fluid Composition ◽  
Fluid Temperature ◽  
Mixed Effect ◽  
Experimental Apparatus ◽  
Air Ingress

The graphite-fuel matrix in the core region of HTGRs can come into direct contact with air at high temperature during air ingress accident. Nuclear grade graphite has been shown to undergo oxidation when subjected to oxidizing flow at high temperatures. There is, however, no agreement on the relative importance of the numerous factors that can contribute to the overall rate of oxidation. Examples of some of these potential factors include graphite temperature, fluid temperature, fluid composition, graphite composition, and graphite surface conditions. Separate effects experiments have, in general, not been able to fully capture these complex interactions. In this work, a new experimental apparatus was designed to conduct mixed-effect experiments to understand the complicated interactions that would influence the oxidation rate and heat removal rate of graphite exposed to a high temperature air ingress. Utilizing thermographic methods, experiments detailing the local temperature response of a representative graphite flow channel were conducted at high temperatures (1173 K) in both oxidizing and inert gaseous environments.

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