Raman spectroscopy of synthetic, geological and biological vaterite: a Raman spectroscopic study

2009 ◽  
Vol 41 (2) ◽  
pp. 193-201 ◽  
Author(s):  
U. Wehrmeister ◽  
A. L. Soldati ◽  
D. E. Jacob ◽  
T. Häger ◽  
W. Hofmeister
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Study ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study

Raman Spectroscopic Study Of Ion-Implanted And Annealed Silicon.

1995 ◽  
Vol 406 ◽  
Author(s):  
David. D. Tuschel ◽  
James P. Lavine ◽  
Jeffrey B. Russell
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Spectroscopic Study ◽  
Complete Recovery ◽  
Acoustic Mode ◽  
Raman Intensity ◽  
Optical Mode ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Transverse Acoustic

AbstractRaman spectroscopy is used to characterize silicon implanted with arsenic and then annealed. The implant dose ranged from 2 × 1012 to 2 × 1013/cm2. The as-implanted samples show a decreased Raman intensity of the 520 cm−1 optical mode, and increased Raman intensity between 400 and 500 cm−1 with respect to an unimplanted silicon wafer. The higher arsenic doses show an increase in the second-order transverse acoustic-mode (TA) intensity around 300 cm−1 relative to the secondorder transverse optical-mode (TO) intensity near 970 cm−1. Annealing restores the 2TA/2TO relative intensities and sharpens the weak peaks between 600 and 900 cm−1. The Raman spectrum is altered by the lowest dose implant and the annealing steps do not lead to a complete recovery of the pre-implant Raman spectrum. This permits the monitoring of lowdose ion-implant damage recovery with Raman spectroscopy.

Kaolinite hydroxyls in dimethylsulphoxide-intercalated kaolinites at 77 K – a Raman spectroscopic study

Clay Minerals ◽  
2000 ◽  
Vol 35 (2) ◽  
pp. 443-454 ◽  
Author(s):  
R. L. Frost ◽  
J. Kristof ◽  
E. Horvath ◽  
J. T. Kloprogge
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Study ◽  
Dmso Molecule ◽  
Molecular Forms ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Surface Hydroxyl Groups ◽  
Inner Surface

AbstractKaolinite hydroxyls in dimethylsulphoxide-intercalated (DMSO-intercalated) kaolinites have been determined using Raman spectroscopy at 298 and 77 K. The inner surface hydroxyl frequencies at 3650, 3670, 3684 and 3693 cm-1 move to higher wavenumbers upon cooling to 77 K and are observed at 3659, 3676, 3692 and 3702 cm-1. The inner hydroxyl frequency is at 3620 cm-1 at 298 K and is at 3615 cm-1 at 77 K. Upon intercalation with DMSO, additional bands are found at 3660, 3536 and 3501 cm-1 for the low-defect kaolinite and at 3664, 3543 and 3509 cm-1 for the high-defect kaolinite at 298 K. The 3660 cm-1 band at 298 K is resolved into two bands at 3658 and 3663 cm-1 at 77 K for the low-defect kaolinite and these bands are assigned to the inner surface hydroxyl groups, hydrogen-bonded to the DMSO molecule. It is proposed that the DMSO molecule exists with two different orientations in the intercalate and these two molecular forms are differentiated by the OH-stretching bands of the inner surface hydroxyl groups. This band for the high-defect kaolinite is found at 3664 cm-1 at 298 K and resolves into two bands at 3664 and 3673 cm-1 at 77 K.

Organic–inorganic interactions of single crystalline organolead halide perovskites studied by Raman spectroscopy

2016 ◽  
Vol 18 (27) ◽  
pp. 18112-18118 ◽  
Author(s):  
Li-Qiang Xie ◽  
Tai-Yang Zhang ◽  
Liang Chen ◽  
Nanjie Guo ◽  
Yu Wang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Study ◽  
Single Crystals ◽  
Single Crystalline ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Halide Perovskites ◽  
Organolead Halide

Perovskite single crystals with varied cations and halides have been grown for Raman spectroscopic study of their organic–inorganic interactions.

A Raman Spectroscopic Study of the Initial Stages of Hydrolysis Oftetraethoxysilane

1992 ◽  
Vol 271 ◽  
Author(s):  
J. D. Barrie ◽  
K. A. Aitchison
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Study ◽  
Catalyst Concentration ◽  
Reaction Rates ◽  
Reaction Products ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Condensation Reactions ◽  
Multichannel Detection ◽  
Hydrolysis And Condensation

ABSTRACTMultichannel detection Raman spectroscopy was used to follow the hydrolysis and condensation reactions of TEOS/ethanol solutions. Effects of alkoxide concentration, catalyst concentration, watenTEOS ratios, and temperature were studied. It was found that the initial oligomeric composition of hydrolyzed solution was dependent upon the amount of water added to the solution: not only did reaction rates differ, but so to did the reaction products. Higher water concentrations resulted in formation of an oligomer which may contain a trisiloxane ring.

A preliminary Raman spectroscopic study of urine: diagnosis of breast cancer in animal models

The Analyst ◽  
2015 ◽  
Vol 140 (2) ◽  
pp. 456-466 ◽  
Author(s):  
T. Bhattacharjee ◽  
A. Khan ◽  
G. Maru ◽  
A. Ingle ◽  
C. Murali Krishna
Keyword(s):  
Breast Cancer ◽  
Raman Spectroscopy ◽  
Animal Models ◽  
Spectroscopic Study ◽  
Diagnostic Tool ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Analysis Of Urine

Analysis of urine by Raman spectroscopy (RS) as an alternative screening and diagnostic tool for breast cancer..

Raman spectroscopic study of artificially twisted and non-twisted trilayer graphene

2021 ◽  
Vol 118 (13) ◽  
pp. 133101
Author(s):  
Sanghyun Kim ◽  
Donghyeon Lee ◽  
Binbin Wang ◽  
Shang-Jie Yu ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Trilayer Graphene

scholarly journals Hydrogen Bonds: Raman Spectroscopic Study

2021 ◽  
Vol 22 (10) ◽  
pp. 5380
Author(s):  
Boris A. Kolesov
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Temperature Region ◽  
Vibrational Frequency ◽  
Chemical Compounds ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Proton Dynamics

The work outlines general ideas on how the frequency and the intensity of proton vibrations of X–H×××Y hydrogen bonding are formed as the bond evolves from weak to maximally strong bonding. For this purpose, the Raman spectra of different chemical compounds with moderate, strong, and extremely strong hydrogen bonds were obtained in the temperature region of 5 K–300 K. The dependence of the proton vibrational frequency is schematically presented as a function of the rigidity of O-H×××O bonding. The problems of proton dynamics on tautomeric O–H···O bonds are considered. A brief description of the N–H···O and C–H···Y hydrogen bonds is given.

ChemInform Abstract: RAMAN SPECTROSCOPIC STUDY OF COBALT-MOLYBDENUM Γ-ALUMINA CATALYSTS

1978 ◽  
Vol 9 (40) ◽  
Author(s):  
J. MEDEMA ◽  
C. VAN STAM ◽  
V. H. J. DE BEER ◽  
A. J. A. KONINGS ◽  
D. C. KONINGSBERGER
Keyword(s):  
Spectroscopic Study ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Alumina Catalysts
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