Growth of Few Layers Graphene on Silicon Carbide from Nickel Silicide Supersaturated with Carbon

2010 ◽  
Vol 645-648 ◽  
pp. 589-592 ◽  
Author(s):  
Konstantin Vassilevski ◽  
Irina P. Nikitina ◽  
Alton B. Horsfall ◽  
Nicolas G. Wright ◽  
C. Mark Johnson
Keyword(s):  
Silicon Carbide ◽  
Raman Scattering ◽  
Optical Microscopy ◽  
Nickel Silicide ◽  
Raman Scattering Spectroscopy ◽  
Wet Processing ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
20 Nm ◽  
Lorentzian Shape

Few Layers Graphene (FLG) films were grown on the carbon-terminated surface of 4H-SiC from nickel silicide supersaturated with carbon. The process was realised by annealing of thin Ni films deposited on silicon carbide followed by wet processing to remove the nickel silicide. To identify and characterize the fabricated FLG films, micro-Raman scattering spectroscopy, AFM and optical microscopy have been used. The films grown on samples with initially deposited nickel thinner than 20 nm show clear graphene footprints in micro-Raman scattering spectra, namely a single component, Lorentzian shape 2D band with FWHM remarkably lower than that of the 2D peak of graphite.

Studies Of Orientational Order Of Some Nematogens By Means Of Raman Scattering Spectroscopy

2004 ◽  
Vol 59 (7-8) ◽  
pp. 510-516 ◽  
Author(s):  
Ewa Chrzumnicka ◽  
Mirosław Szybowicz ◽  
Danuta Bauman
Keyword(s):  
Liquid Crystals ◽  
Raman Scattering ◽  
Orientational Order ◽  
Polarized Light ◽  
Molecular Structures ◽  
Raman Scattering Spectroscopy ◽  
Linearly Polarized ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
Molecular Distribution Function

The orientational behaviour of some liquid crystals with various molecular structures was studied by means of the Raman scattering depolarization method. The Raman scattering spectra of linearly polarized light were recorded as a function of temperature in the nematic phase. On the basis of these spectra the order parameters 〈P2〉 and 〈P4〉 as well as the molecular distribution function were determined. The obtained data were compared with those estimated on the basis of polarized light absorption and emission measurements. The influence of the molecular structure on the orientational order of liquid crystals was discussed.

scholarly journals Complete analytic anharmonic hyper-Raman scattering spectra

2016 ◽  
Vol 18 (32) ◽  
pp. 22331-22342 ◽  
Author(s):  
Yann Cornaton ◽  
Magnus Ringholm ◽  
Kenneth Ruud
Keyword(s):  
Perturbation Theory ◽  
Raman Scattering ◽  
Second Order ◽  
Raman Scattering Spectroscopy ◽  
Scattering Spectra ◽  
Raman Scattering Spectra

Complete second-order vibrational perturbation theory applied to hyper-Raman scattering spectroscopy.

Spectrometer for polarized soft X-ray Raman scattering

1998 ◽  
Vol 5 (3) ◽  
pp. 1013-1015 ◽  
Author(s):  
Y. Harada ◽  
H. Ishii ◽  
M. Fujisawa ◽  
Y. Tezuka ◽  
S. Shin ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Energy Range ◽  
Incident Beam ◽  
Experimental System ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Photon Factory ◽  
Scattering Spectra ◽  
Ray Trace ◽  
Raman Scattering Spectra

An experimental system for polarized soft X-ray Raman scattering spectroscopy has been constructed. The soft X-ray spectrometer is based on the Rowland circle geometry with a holographic spherical grating. Three types of gratings are used to cover the energy range from 18 eV to 1200 eV. According to a ray-trace simulation, the resolution is expected to be 200 meV at 700 eV by using a 10 µm slit width. The polarized and depolarized soft X-ray Raman scattering spectra can be measured by rotating the soft X-ray spectrometer around the axis of the incident beam. Preliminary measurements of polarized and depolarized spectra were accomplished at undulator beamline BL-2C of the Photon Factory.

scholarly journals Application of Vibrational Spectroscopy Supported by Theoretical Calculations in Identification of Amorphous and Crystalline Forms of Cefuroxime Axetil

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Alicja Talaczyńska ◽  
Kornelia Lewandowska ◽  
Anna Jelińska ◽  
Piotr Garbacki ◽  
Agnieszka Podborska ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Density Functional ◽  
Theoretical Calculations ◽  
Cefuroxime Axetil ◽  
Basis Set ◽  
Raman Scattering Spectroscopy ◽  
Scattering Spectra ◽  
Ft Ir ◽  
Raman Scattering Spectra ◽  
Ir And Raman

FT-IR and Raman scattering spectra of cefuroxime axetil were proposed for identification studies of its crystalline and amorphous forms. An analysis of experimental spectra was supported by quantum-chemical calculations performed with the use of B3LYP functional and 6-31G(d,p) as a basis set. The geometric structure of a cefuroxime axetil molecule, HOMO and LUMO orbitals, and molecular electrostatic potential were also determined by using DFT (density functional theory). The benefits of applying FT-IR and Raman scattering spectroscopy for characterization of drug subjected to degradation were discussed.

scholarly journals Crystal structure of new formamidinium triiodide jointly refined by single-crystal XRD, Raman scattering spectroscopy and DFT assessment of hydrogen-bond network features

2021 ◽  
Vol 77 (7) ◽  
pp. 692-695
Author(s):  
Artem A. Ordinartsev ◽  
Andrey A. Petrov ◽  
Konstantin A. Lyssenko ◽  
Andrey V. Petrov ◽  
Eugene A. Goodilin ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Raman Scattering ◽  
Population Analysis ◽  
Hydrogen Atoms ◽  
Mulliken Population ◽  
Triclinic Space Group ◽  
Raman Scattering Spectroscopy ◽  
Scattering Spectra ◽  
Bond Network ◽  
Raman Scattering Spectra

A novel triiodide phase of the formamidinium cation, CH5N2 +·I3 −, crystallizes in the triclinic space group P\overline{1} at a temperature of 110 K. The structure consists of two independent isolated triiodide ions located on inversion centers. The centrosymmetric character of I3 − was additionally confirmed by the observed pronounced peaks of symmetrical oscillations of I3 − at 115–116 cm−1 in Raman scattering spectra. An additional structural feature is that each terminal iodine atom is connected with three neighboring planar formamidinium cations by N—H...I hydrogen bonding with the N—H...I bond length varying from 2.81 to 3.08 Å, forming a deformed two-dimensional framework of hydrogen bonds. A Mulliken population analysis showed that the calculated charges of hydrogen atoms correlate well with hydrogen-bond lengths. The crystal studied was refined as a three-component twin with domain ratios of 0.631 (1):0.211 (1):0.158 (1).

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