Identification of Vibrational Modes in BaSi2 Epitaxial Films by Infrared and Raman Spectroscopy

2018 ◽  
Vol 386 ◽  
pp. 43-47 ◽  
Author(s):  
Hirofumi Hoshida ◽  
Naoki Murakoso ◽  
Takashi Suemasu ◽  
Yoshikazu Terai
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Epitaxial Films ◽  
Ir Absorption ◽  
Vibrational Modes ◽  
Depolarization Ratio ◽  
Phonon Line ◽  
Infrared And Raman Spectroscopy ◽  
Raman Intensities ◽  
Polarized Raman

Infrared (IR) absorption and polarized Raman spectra were measured in BaSi2 epitaxial films to investigate the vibrational modes and the symmetry of Si4 cluster in BaSi2. By an analysis based on Raman and/or IR activity in the spectra, the symmetry of Si4 cluster was determined as Th-symmetry and the observed Raman lines and IR peaks were assigned to Ag, Eg, Fg, and Fu, respectively. In the three Raman lines of Fg-mode, one LO phonon line and two TO phonon lines were classified by the depolarization ratio of polarized Raman intensities.

Raman spectroscopy study of new thia- and oxazinoquinolinium triodides

2015 ◽  
Vol 39 (8) ◽  
pp. 6163-6170 ◽  
Author(s):  
Irina D. Yushina ◽  
Boris A. Kolesov ◽  
Ekaterina V. Bartashevich
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Spatial Organization ◽  
Spectroscopy Study ◽  
Raman Intensities ◽  
Polarized Raman

New polyiodides of thia- and oxa-zinoquinolinium derivatives were characterized using Raman spectroscopy and periodic 3D calculations of the Raman intensities. Polarized Raman spectra of the oriented crystals revealed the features of spatial organization in the polyiodide-anion chains.

scholarly journals Optical Spectroscopy of a Nitrogen-Hydrogen Complex in ZnSe

1993 ◽  
Vol 325 ◽  
Author(s):  
J. A. Wolk ◽  
J. W. Ager ◽  
K. J. Duxstad ◽  
E. E. Haller ◽  
N. R. Taskar ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Vapor Phase ◽  
Vibrational Mode ◽  
Vibrational Modes ◽  
Organic Vapor ◽  
Infrared And Raman Spectroscopy ◽  
Metal Organic ◽  
Polarized Raman Spectroscopy ◽  
Local Vibrational Modes ◽  
Polarized Raman

AbstractWe have observed two local vibrational modes related to H bonded to N acceptors in ZnSe samples grown by metal organic vapor phase epitaxy. The modes have been seen in both infrared and Raman spectroscopy. The new mode seen at 3194 cm-1 is assigned to an N-H stretching vibrational mode and the mode found at 783 cm-1 is tentatively assigned to an N-H wagging vibrational mode. Polarized Raman spectroscopy was used to determine that the symmetry of the defect complex is C3v, which implies that the H atom is in either a bonding or anti-bonding position.

scholarly journals Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1951
Author(s):  
Dmitry Petrov
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Natural Gas ◽  
Raman Spectra ◽  
Pressure Dependence ◽  
Pressure Range ◽  
Gas Composition ◽  
Depolarization Ratio ◽  
Depolarization Ratios

In this work, we measured the intensities of Q-branches of the ν1, ν2 and ν3 bands in the polarized and depolarized methane Raman spectra in the pressure range of 1–60 atm. It was established that the pressure dependence of depolarization ratios of the ν2 and ν3 bands are negligible. In turn, the depolarization ratio of the ν1 band increases with increasing pressure and reaches approximately 0.0045 at 60 atm. These data are more precise than previously published ones because ν1 band intensities were determined taking into account the contribution of overlapping lines of ν3 band. The presented data will be useful in calculating the methane polarizabilities at high pressure, as well as in calculating methane Raman spectra for measuring the natural gas composition using Raman spectroscopy.

Polarized Raman spectra of tetragonal pureZrO2measured on epitaxial films

2002 ◽  
Vol 65 (14) ◽  
Author(s):  
Thérèse Merle ◽  
René Guinebretiere ◽  
Andrei Mirgorodsky ◽  
Pierre Quintard
Keyword(s):  
Raman Spectra ◽  
Epitaxial Films ◽  
Polarized Raman

Raman spectroscopy with simultaneous measurement of two orthogonally polarized Raman spectra

2003 ◽  
Vol 34 (5) ◽  
pp. 345-349 ◽  
Author(s):  
G. A. Thomson ◽  
K. J. Baldwin ◽  
D. N. Batchelder
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Simultaneous Measurement ◽  
Polarized Raman

Raman Spectra of Haloaluminate Melts Containing Oxides

1989 ◽  
Vol 43 (2) ◽  
pp. 336-341 ◽  
Author(s):  
B. P. Gilbert ◽  
R. W. Berg ◽  
N. J. Bjerrum
Keyword(s):  
Raman Spectroscopy ◽  
Melting Point ◽  
Visible Light ◽  
Raman Spectra ◽  
Raman Band ◽  
Band Intensity ◽  
Metallic Aluminum ◽  
Fused Quartz ◽  
Polarized Raman

Raman spectroscopy measurements on haloaluminate melts (bromides and chlorides), with or without addition of the corresponding aluminum oxohalide, have unequivocally shown that even the most carefully cleaned melts exhibit a polarized Raman band, due to the presence of aluminum oxohalide complexes. The frequency of this characteristic oxide Raman band is ∼280–270 cm−1 for the chloride and ∼185 cm−1 for the bromide system, respectively. Hence, being halide dependent, the observed band cannot be assigned entirely to Al-O vibrations within the skeleton of the aluminum oxohalide species but must also involve some movement of the halide atoms. At temperatures just above the melting point, studies of the oxide band intensity vs. time showed that molten AlCl3 and AlBr3 attack Pyrex® glass, fused quartz, and sapphire containers, causing dissolution of oxides; within few hours, the melts become almost saturated. Finally, it has been found that acidic chloroaluminate melts, which invariably tend to fluoresce when illuminated with visible light contained in a glass or silicate container, owe their fluorescing properties to a reaction between the container and the AlCl3. This troublesome fluorescence can be quenched by addition to the melt of a reductant such as metallic aluminum.

Intensities in Raman spectra V. Intensity measurements and normal co-ordinates for some group IV tetrahalides

1957 ◽  
Vol 240 (1223) ◽  
pp. 499-508 ◽  
Keyword(s):  
Raman Spectra ◽  
Potential Field ◽  
Group Iv ◽  
Vibrational Modes ◽  
Intensity Measurements ◽  
Bond Polarizability ◽  
Raman Intensities

The calculation of the coefficients l tξ , pσ and l -1 pσ tξ relating symmetry co-ordinates and normal co-ordinates is reported for the series of molecules CCI 4 , CBr 4 , SiCl 4 , SiBr 4 , GeCl 4 , GeBr 4 , SnCl 4 and SnBr 4 . A potential field suggested by Simanouti has been used and tables of the transformation coefficients are quoted. The preparation and purification of some of these compounds is described. The relative Raman intensities of the degenerate vibrational modes of these molecules have been measured. The intensities of these molecules are discussed in terms of the bond-polarizability theory.

Coordination complexes of gallium(III) and indium(III) halides. IV. Infrared spectra, Raman spectra, and structures of complexes with dimethylsulfoxide and dimethylsulfoxide-d6

1970 ◽  
Vol 48 (3) ◽  
pp. 492-500 ◽  
Author(s):  
J. Carty ◽  
H. A. Patel ◽  
P. M. Boorman
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Coordination Complexes ◽  
Infrared And Raman Spectroscopy ◽  
Gallium Trichloride

The preparation and characterization by far-infrared and Raman spectroscopy of dimethylsulfoxide (dmso) and dimethylsulfoxide-d6 (dmso-d6) complexes of gallium trihalides are reported. The compounds GaX3(dmso)6 (X = Br, I) have ionic structures containing the hexacoordinate cation Ga(dmso)63+. Reaction of gallium trichloride with dmso gives GaCl3(dmso)1.5. This compound appears to be identical with GaCl3(dmso)2 described by other workers and has been shown to have the structure [Ga(dmso)6][GaCl4]3. Some new vibrational data are presented for InX3(dmso)3 (X = Cl, Br) and InI3(dmso)2.

Infrared And Raman Spectroscopy Of Organic Electron Conductors

1993 ◽  
Vol 328 ◽  
Author(s):  
R. Ridaura ◽  
R. GóMez ◽  
V. Marquina ◽  
S. Aburto ◽  
M. L. Marquina ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Charge Transfer ◽  
Ir Absorption ◽  
Acceptor Molecule ◽  
Fluorene Derivative ◽  
Infrared And Raman Spectroscopy ◽  
Organic Electron ◽  
Absorption Frequencies ◽  
Degree Of Charge Transfer ◽  
Ft Raman

ABSTRACTFT-Raman and infrared (IR) spectra of a series of TTF-fluorene derivative family were obtained using a conventional IR spectrometer and a FT-Raman spectrometer. The Raman shifts of the observed band (ν3 stretching band) changes from sample to sample and we correlate these changes with the degree of charge transfer between the donor (TTF) and the acceptor (fluorene derivative) Molecules. These results are compared with those obtained from changes in the IR absorption frequencies of the C≡N stretching mode in the acceptor Molecule.

scholarly journals Polarized Raman Spectra and Infrared Analysis of Vibrational Modes in L-Threonine Crystals

1998 ◽  
Vol 28 (1) ◽  
pp. 19-24 ◽  
Author(s):  
B.L. Silva ◽  
P.T.C. Freire ◽  
F.E.A. Melo ◽  
I. Guedes ◽  
M.A. Araújo Silva ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Infrared Analysis ◽  
Vibrational Modes ◽  
Polarized Raman
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