A Furnace for Molten Salt Raman Spectroscopy to 800°C

1971 ◽  
Vol 25 (1) ◽  
pp. 82-84 ◽  
Author(s):  
Arvin S. Quist
Keyword(s):  
Raman Spectroscopy ◽  
Laser Beam ◽  
Molten Salts ◽  
Spectroscopic Studies ◽  
Sample Container ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Different Types ◽  
Sample Chamber ◽  
Metal Block

A vacuum tight furnace has been constructed and used for laser-Raman spectroscopic studies of molten salts to 800°C. The sample container is positioned within the furnace by a removable metal block, several designs of which have been used with different types of sample containers. The sample under investigation is easily and rapidly aligned in the laser beam by means of micrometer screws located on the positioning table which supports the furnace. The compactness of the entire unit allows it to be readily moved into and out of the sample chamber of the spectrometer.

scholarly journals Cryogenic Raman Spectroscopic Studies on Common Ore-forming Fluid Systems

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 363
Author(s):  
Dan Yang ◽  
Xin Xiong ◽  
Weishi Chen
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Correlation Coefficient ◽  
Fluid Inclusions ◽  
Intensity Ratio ◽  
Spectroscopic Studies ◽  
Ore Deposits ◽  
Raman Spectroscopic ◽  
Freezing Method ◽  
Fluid Systems

The composition and properties of ore-forming fluids are key to understanding the mechanisms of mineralization in ore deposits. These characteristics can be understood by studying fluid inclusions. Hydrates in fluid inclusions containing NaCl–H2O and MgCl2–H2O were studied using cryogenic Raman spectroscopy. The intensity ratio of peaks at 3401, 3464, 3514, and 3090 cm−1 shows a positive correlation with the concentration of hydrates in the inclusions, as does the ratio of the total integrated area of the MgCl2 hydrate peak (3514 cm−1) to the 3090 cm−1 peak with the concentration of MgCl2 (correlation coefficient >0.90). These correlations are important in the quantitative analysis of MgCl2 in synthetic and natural NaCl–MgCl2–CaCl2–H2O-bearing fluid inclusions. Semi-quantitative analysis of NaCl–MgCl2–H2O solutions indicates that peaks at 3437 and 3537 cm−1 reflect the presence of NaCl in the solution. Further, a peak at 3514 cm−1 is indicative of the presence of MgCl2. The relative intensities of these peaks may be related to the relative abundances of NaCl and MgCl2. A quantitative attempt was made on NaCl–MgCl2–CaCl2–H2O system, but it was found that quantifying NaCl, MgCl2 and CaCl2 separately in NaCl–MgCl2–CaCl2–H2O system by the secondary freezing method is difficult.

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.

Raman Spectroscopic Identification of Fibrous Natural Zeolites

1998 ◽  
Vol 52 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Brigitte Wopenka ◽  
John J. Freeman ◽  
Tony Nikischer
Keyword(s):  
Beam Polarization ◽  
X Ray Diffraction ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Different Types ◽  
Spectroscopic Identification ◽  
The Difference ◽  
The Individual ◽  
Spectral Patterns ◽  
Raman Spectral

Laser Raman microprobe spectra of the natrolite group of zeolites (fibrous hydrous network aluminosilicates) can be used to unambiguously distinguish among the six members of this group, which is difficult by visual, microscopic, and X-ray diffraction methods. The natrolite group of zeolites includes the following minerals: natrolite (Na2Al2Si3O10·2H2O), scolecite (CaAl2Si3O10·3H2O), mesolite (Na2Ca2Al6Si9O30·8H2O), thomsonite (NaCa2Al5Si5O20·6H2O), gonnardite (Na2CaAl4Si6O20·7H2O), and edingtonite (BaAl2Si3O10·4H2O). Accurate locations of peak maxima are given, and complete Raman spectra (from 100 to 4000 Δcm−1) are shown for each mineral. The individual members of this structurally very similar group of minerals can be identified on the basis of the exact Raman peak positions of the two strongest bands near 440 and 535 Δcm−1, the number and positions of weaker bands, and the difference in the dependence of peak intensities upon beam polarization direction. However, the minerals can be especially easily identified on the basis of their strikingly different Raman spectral patterns in the O–H stretching region (3000–3700 Δcm−1). The number and width of peaks in this spectral region correlate with the three different types of framework structures that occur among the natrolite group minerals.

Raman Spectroscopic Studies of Amsacrine

1992 ◽  
Vol 46 (10) ◽  
pp. 1540-1544 ◽  
Author(s):  
Catherine A. Butler ◽  
Ralph P. Cooney ◽  
William A. Denny
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Crystal Structure Data ◽  
Visible Spectrum ◽  
Spectroscopic Studies ◽  
Resonance Raman Spectrum ◽  
Raman Spectroscopic ◽  
Ft Raman Spectroscopy ◽  
Uv Visible ◽  
Ft Raman

Amsacrine (4′-(9-acridinylamino)methanesulfon- m-anisidide) in both solid and aqueous forms was characterized with the use of resonance and nonresonance Raman spectroscopy (including FT-Raman spectroscopy). Evidence that the acridine nucleus is the dominant chromophoric unit contributing to the resonance Raman spectrum is based upon the apparent similarities of the spectra of aqueous amsacrine (in the unpro-tonated form) and acridine (in ethanol). The probable non-coplanarity of the acridine and phenyl units in the amsacrine molecule (based on previously reported crystal structure data) is consistent with the suggestion that the acridine nucleus may constitute an independent chromophoric unit. Further evidence is derived from analysis of the UV-visible spectrum, which indicates that excitation at 457.9 nm falls within an electronic transition of the acridine nucleus of amsacrine. The excitation profiles of aqueous amsacrine are presented, and four types of profiles have been identified.

scholarly journals Operando Raman spectroscopic studies of lithium zirconates during CO2 capture at high temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 8222-8231 ◽  
Author(s):  
Diana Peltzer ◽  
John Múnera ◽  
Laura Cornaglia
Keyword(s):  
Raman Spectroscopy ◽  
High Temperature ◽  
Co2 Capture ◽  
Phase Evolution ◽  
Spectroscopic Studies ◽  
Capture Process ◽  
Raman Spectroscopic

Operando Raman spectroscopy allowed following up the phase evolution for K-doped lithium zirconates during the CO2 capture process.

A technique for laser raman spectroscopic studies of isolated cell populations

1983 ◽  
Vol 129 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Pierre Jeannesson ◽  
Michel Manfait ◽  
Jean-Claude Jardillier
Keyword(s):  
Spectroscopic Studies ◽  
Cell Populations ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Isolated Cell
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