Results 251 to 260 of about 231,425 (302)
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Model analysis of the Raman spectrum from fused silica optical fibers
Applied Optics, 1982Abstract : The Raman spectrum from pure silica optical fibers has been analyzed into a set of Gaussian components. Each component used is related to an observed feature of the spectrum, and a residual of about 1% resulted without the use of additional components. Both single- and multi-phonon peaks were fitted.
G E, Walrafen, P N, Krishnan
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The Raman spectrum and analysis of phonon modes in sodalite
Journal of Physics C: Solid State Physics, 1981Polarised Raman spectra of chloro- and bromo-sodalite (Na4Al3(SiO4)3Br)2 single crystals have been recorded, and 28 of the predicted 32 Raman-active phonon modes observed. A full group-theoretical analysis of the zone-centre phonons is given. The internal modes are assigned using as a basis the normal mode frequencies of the XO4 complex (X=Si or Al). A
J Ariai, S R P Smith
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[Laser Raman spectrum analysis of carbendazim pesticide].
Guang pu xue yu guang pu fen xi = Guang pu, 2015Raman signal of solid and liquid carbendazim pesticide was collected by laser Raman spectrometer. The acquired Raman spectrum signal of solid carbendazim was preprocessed by wavelet analysis method, and the optimal combination of wavelet denoising parameter was selected through mixed orthogonal test. The results showed that the best effect was got with
Xiao-bin, Wang +5 more
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Analysis and Explanation of Agglomeration Phenomenon Based on Raman Spectrum
Advanced Materials Research, 2015In this paper, from the standpoint of Raman spectrum research aspect in material science, Raman spectrum analysis of graphite and diamond microcrystal retained by gallium phosphide nanoparticles is introduced. We found that molecular configuration of basic fuchsin adsorbed on gallium phosphide nanoparticles through experiments.
Hai Ling Li +3 more
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Theoretical analysis of the resonance Raman spectrum of tryptophan
Journal of Raman Spectroscopy, 1991AbstractThe resonance Raman excitation profiles of tryptophan in the region 240‐200 nm were calculated, taking into account the molecular properties of its chromophore, indole. The relevant quantities such as state displacements and vibronic coupling terms were evaluated by means of quantum mechanical semi‐empirical methods.
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Raman spectrum and factor group analysis of crystalline titanium tetrachloride
Journal of the Chemical Society D: Chemical Communications, 1971The Raman spectrum of crystalline titanium tetrachloride has been obtained at ca. 77K, and a factor group analysis of the fundamentals is presented in terms of the known space group C2h5.
R. J. H. Clark +2 more
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Raman spectrum and normal co-ordinate analysis of chromyl chloride
Spectrochimica Acta, 1959Abstract The complete Raman spectrum of CrO 2 Cl 2 , obtained by excitation with helium radiations in the red and near infrared region of the spectrum, is reported. The nine fundamental modes of vibration of the molecule, belonging to the C 2υ point group, are Raman-active and have been assigned to the observed frequencies.
H. Stammreich, K. Kawai, Yara Tavares
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Application of artificial neural network to quantitative analysis of Raman spectrum
SPIE Proceedings, 2006By means of Artificial Neural Network and Back-Propagation algorithm, the multi-component of azo-dyes can be qualitatively and quantitatively analyzed simultaneously, though their Raman spectra are overlapped. This article designed a Back-Propagation algorithm network to analyze the multi-component of azo-dyes (Sudan I and Sudan III). In conclusion,
Chen Chen, Guoping Zhang, Gang Li
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Defects and stress analysis of the Raman spectrum of diamond films
Diamond and Related Materials, 1992Abstract Diamond films were deposited on silicon substrates at 750 °C, by the hot-filament technique, from a reactive CH 4 (0.1–2%) H 2 mixtures. Two wide Gaussian lines around 1330 and 1500 cm−1 with coupled variations in the whole preparation range appeared in the global Raman spectra.
E. Gheeraert +3 more
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A New Continuum Regression Method for Quantitative Analysis of Raman Spectrum
2012 11th International Conference on Machine Learning and Applications, 2012Quantitative analysis of Raman spectrum using Surface Enhanced Raman scattering (SERS) nanoparticles has shown the potential and promising trend of development in vivo molecular imaging. Because of the high dimension of Raman spectra and limited number of samples, latent variable regression methods, e.g.
Shuo Li +3 more
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