Results 261 to 270 of about 97,579 (314)
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Polarized Raman Spectra X. Polarized Raman Spectra of Naphthalene Single Crystal
Journal of the Chinese Chemical Society, 1972AbstractThe polarized Raman spectra of naphthalene single crystal are recorded with a laser Raman spectrometer. Relative intensites of Raman lines in various polarizations are accurately measured by photon‐counting technique. All the strong lines are polarized in the c′c′ and bb polarizations, and the polarization data alone are not sufficient to ...
Tien‐Pin Lin, Chen‐Hanson Ting
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Journal of Molecular Structure, 1986
Abstract Raman spectra of amorphous phthalocyanine thin films have been studied. Theoretical and experimental correlations in polarization ratios are applied to vibrational assignments of symmetry species and to the problem of molecular orientation in thin solid films.
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Abstract Raman spectra of amorphous phthalocyanine thin films have been studied. Theoretical and experimental correlations in polarization ratios are applied to vibrational assignments of symmetry species and to the problem of molecular orientation in thin solid films.
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Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1979
Selection rules for resonance Raman spectra are given for several porphins of D 4h point group symmetry. A normal coordinate treatment is presented, based on a potential function for which stretching and bending force constants are related to bond lengths, and to the product of the bond lengths of the bonds defining
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Selection rules for resonance Raman spectra are given for several porphins of D 4h point group symmetry. A normal coordinate treatment is presented, based on a potential function for which stretching and bending force constants are related to bond lengths, and to the product of the bond lengths of the bonds defining
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Solid State Communications, 1976
Abstract The crystal structure of K 2 CuF 4 has been studied by means of Raman scattering. The structure is found to belong to the space group D 4 h 5 rather than D 4 h 17 of K 2 NiF 4 between 2 and 800 K because of the distortion arising from the “orbital ordering effect”.
M. Kaneko, G. Kuwabara, A. Misu
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Abstract The crystal structure of K 2 CuF 4 has been studied by means of Raman scattering. The structure is found to belong to the space group D 4 h 5 rather than D 4 h 17 of K 2 NiF 4 between 2 and 800 K because of the distortion arising from the “orbital ordering effect”.
M. Kaneko, G. Kuwabara, A. Misu
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Raman Spectra of NanophaseCr2O3
Journal of Raman Spectroscopy, 1996The Raman spectra of nanometer-sized Cr2O3 particles (annealed in air and in vacuum at different temperatures) at room temperature are reported. The results show that the correlation between the change of the Raman spectrum of nanometer Cr2O3 and its crystal size is different from that of other nanometer-sized materials.
Jian Zuo +5 more
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Raman spectra of Nd1.85Ce0.15CuO4
Solid State Communications, 1991Abstract We present the polarized Raman scattering spectra of the Nd 1.85 Ce 0.15 CuO 4 single crystal at room temperature. In addition to the three known Raman active phonons of this high temperature oxide at 227cm −1 (A 1g ), 330 cm −1 (B 1g ), and 477 cm −1 (E g ), the remaining E g symmetry mode at 122 cm −1 is clearly observed.
Z.V. Popovic, A. Sacuto, M. Balkanski
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Raman Spectra of Carbohydrates
Journal of the Chinese Chemical Society, 1972AbstractThe Raman spectra of 13 different carbohydrates are investigated by a laser Raman spectrometer. It is found the C—H stretching vibrations around 3000 cm−1 is the best region for qualitative analysis of these compounds. All compounds show an O—H stretching vibration around 3370 cm−1 which was not mentioned by earlier works.
I‐Cheng Wang, Chen‐Hanson Ting
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Ferroelectrics, 1971
The Raman spectra of Ba2NaNb5O15 single crystals were recorded for various scattering configurations from 77°K to 843°K. Splittings of the vibrational modes due to electrostatic and anisotropic forces were found to be small. The line-widths of the 650 cm-1 and the 280 cm-1 modes were found to increase with increasing temperature.
L. C. Bobb, I. Lefkowitz, L. Muldawer
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The Raman spectra of Ba2NaNb5O15 single crystals were recorded for various scattering configurations from 77°K to 843°K. Splittings of the vibrational modes due to electrostatic and anisotropic forces were found to be small. The line-widths of the 650 cm-1 and the 280 cm-1 modes were found to increase with increasing temperature.
L. C. Bobb, I. Lefkowitz, L. Muldawer
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Spectrochimica Acta Part A: Molecular Spectroscopy, 1978
Abstract Four single crystals of tourmaline lying within the elbaite: Na(Li, Al) 3 Al 6 B 3 Si 6 O 27 (OH, F) 4 -schorl: Na(Fe 2+ ) 3 Al 6 B 3 Si 6 O 27 (OH, F) 4 series have been studied. The spectra were recorded at the 100–1200 cm −1 region. From a dynamical point of view it appears that tourmaline structure can not be subdivided in separate ...
M.A. Alvarez, R. Coy-Yll
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Abstract Four single crystals of tourmaline lying within the elbaite: Na(Li, Al) 3 Al 6 B 3 Si 6 O 27 (OH, F) 4 -schorl: Na(Fe 2+ ) 3 Al 6 B 3 Si 6 O 27 (OH, F) 4 series have been studied. The spectra were recorded at the 100–1200 cm −1 region. From a dynamical point of view it appears that tourmaline structure can not be subdivided in separate ...
M.A. Alvarez, R. Coy-Yll
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Journal of Quantitative Spectroscopy and Radiative Transfer, 1982
Abstract The normal modes of the Raman-active phonons in the center of the Brillouin zone in a natural monocrystal of Mg 2 SiO 4 were measured by using Raman scattering. All of the modes predicted by group theory were observed and measured. Some deviations from previously published values in synthetic samples were observed for the low energy phonons.
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Abstract The normal modes of the Raman-active phonons in the center of the Brillouin zone in a natural monocrystal of Mg 2 SiO 4 were measured by using Raman scattering. All of the modes predicted by group theory were observed and measured. Some deviations from previously published values in synthetic samples were observed for the low energy phonons.
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