Results 201 to 210 of about 307,616 (251)
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Spectrochimica Acta Part A: Molecular Spectroscopy, 1971
Abstract The Raman spectra of a single crystal of a MgMoO 4 has been recorded and the results are discussed.
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Abstract The Raman spectra of a single crystal of a MgMoO 4 has been recorded and the results are discussed.
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Journal of Physics: Condensed Matter, 1998
Polarized Raman spectra of crystals (x = 0.1 and 0.7) were studied in the temperature range 10-300 K. Thorough site-symmetry analysis of internal and vibrations combined with factor-group analysis based on hexagonal pseudosymmetry allowed us to make an assignment of the observed modes.
Ivan Gregora +9 more
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Polarized Raman spectra of crystals (x = 0.1 and 0.7) were studied in the temperature range 10-300 K. Thorough site-symmetry analysis of internal and vibrations combined with factor-group analysis based on hexagonal pseudosymmetry allowed us to make an assignment of the observed modes.
Ivan Gregora +9 more
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Proceedings of the Indian Academy of Sciences - Section A, 1938
The available Raman spectral data on terpenic compounds are tabulated and reviewed. It is concluded that the identification of the constituents of a mixture of terpenes by Raman effect methods cannot give trustworthy results until confirmatory results on possible constituents have been obtained.
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The available Raman spectral data on terpenic compounds are tabulated and reviewed. It is concluded that the identification of the constituents of a mixture of terpenes by Raman effect methods cannot give trustworthy results until confirmatory results on possible constituents have been obtained.
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2019
The infrared spectra of organic compounds are associated with transitions between vibrational energy levels. Molecular vibrations may be detected and measured either in an infrared spectrum or indirectly in a Raman spectrum. The most useful vibrations, from the point of view of the organic chemist, occur in the narrower range of 3.5–16 μm (1 μm = 10−6 ...
Dudley H. Williams, Ian Fleming
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The infrared spectra of organic compounds are associated with transitions between vibrational energy levels. Molecular vibrations may be detected and measured either in an infrared spectrum or indirectly in a Raman spectrum. The most useful vibrations, from the point of view of the organic chemist, occur in the narrower range of 3.5–16 μm (1 μm = 10−6 ...
Dudley H. Williams, Ian Fleming
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Raman Spectra of Polyacrylonitrile
Applied Spectroscopy, 1971The polarized Raman spectra of polyacrylonitrile have been obtained and compared with ir spectra. On the basis of the selection rules, various proposed structural models are compared with the experimental results. The spectra suggest a syndiotactic rich composition with a planar structure.
Jack L. Koenig, Y. S. Huang
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Spectroscopy Letters, 1973
Abstract The spectroscopy of porphyrins has been developing rapidly during the last two decades, this class of compounds being of great biological importance and possessing a number of significant properties. Different spectroscopic techniques, viz., electronic spectroscopy including fine-structure quasiline spectra (Shpolsky effect), infrared ...
N. M. Ksenofontova +3 more
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Abstract The spectroscopy of porphyrins has been developing rapidly during the last two decades, this class of compounds being of great biological importance and possessing a number of significant properties. Different spectroscopic techniques, viz., electronic spectroscopy including fine-structure quasiline spectra (Shpolsky effect), infrared ...
N. M. Ksenofontova +3 more
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Raman Spectra of Polyethylenes
The Journal of Chemical Physics, 1963Raman spectra of normal and deuterated polyethylenes in the solid and liquid states were obtained. Tentative assignments for (CD2)n are made using the Teller—Redlich product rule and Krimm's isotopic frequency rule. Interactions between the CD2 deformation and the symmetrical C–C stretching modes of species Ag, and between the CD2 wagging and the ...
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Acta Physica Hungarica, 1987
Raman spectroscopic investigations of silicates show a number of different spectra in dependence of the condensation of SiO4 tetrahedrons. Adsorbed substances are easily detectable because of the weak Raman spectra of silicates. A few optical arrangements are presented which were applied successfully.
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Raman spectroscopic investigations of silicates show a number of different spectra in dependence of the condensation of SiO4 tetrahedrons. Adsorbed substances are easily detectable because of the weak Raman spectra of silicates. A few optical arrangements are presented which were applied successfully.
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Journal of Raman Spectroscopy, 1983
AbstractRaman spectra of CdSb at 100 K are presented. Twenty‐two out of the twenty‐four predicted phonons are detected. Frequencies of different modes are low, implying motions associated with large reduced masses. Their values are comparable to those obtained from infrared measurements.
S. Jandl +3 more
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AbstractRaman spectra of CdSb at 100 K are presented. Twenty‐two out of the twenty‐four predicted phonons are detected. Frequencies of different modes are low, implying motions associated with large reduced masses. Their values are comparable to those obtained from infrared measurements.
S. Jandl +3 more
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Biopolymers, 1969
AbstractThe laser‐excited Raman spectrum of helical polyglycine II has been obtained. Oligomers of polyglycine are in the planar zigzag conformation and their Raman spectra are indicative of the spectrum of polyglycine I. The Raman spectra of polyglycines have bands complementary to the infrared which are sensitive to the conformation of the chain. The
Matthew D. Smith +2 more
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AbstractThe laser‐excited Raman spectrum of helical polyglycine II has been obtained. Oligomers of polyglycine are in the planar zigzag conformation and their Raman spectra are indicative of the spectrum of polyglycine I. The Raman spectra of polyglycines have bands complementary to the infrared which are sensitive to the conformation of the chain. The
Matthew D. Smith +2 more
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