Results 191 to 200 of about 307,616 (251)
Some of the next articles are maybe not open access.
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.
Yi Xie +5 more
openaire +2 more sources
On the Raman spectra of mononucleotides
Journal of Molecular Structure, 1990Abstract The Raman spectra of aqueous solutions of 5′-mononucleotides derived from adenine, uracil, guanine and cytosine have been examined in the 1150-950 cm−1 spectral region. The origin of some common bands, not previously reported, has been discussed by taking into account isotopic frequency shifts, depolarization ratios, normal coordinate ...
Pedro Carmona, M. Molina
openaire +2 more sources
RAMAN SPECTRA OF ALKALI HALIDES
Zeitschrift f�r Physik, 1965Raman spectroscopy is a powerful tool for the study of the structure of matter and the physicochemical problems of the crystalline states of matter. However, in the case of cubic crystals, because of the symmetry properties, most and in some cases all the fundamental modes of vibration are inactive in the Raman effect.
Krishnamurthy, N, Krishnan, RS
openaire +3 more sources
The Raman spectra of the cylophanes
Spectrochimica Acta Part A: Molecular Spectroscopy, 1981Abstract Raman spectra have been obtained for the entire series of [2 n ]-cyclophanes and along with the i.r. spectra, several band assignments have been proposed. A correlation of the frequencies of the in-plane ring modes of the cyclophane with those of the identically substituted methylated benzene has been made.
Paul H. Scudder +3 more
openaire +2 more sources
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.
Chen-Hanson Ting, I-Cheng Wang
openaire +2 more sources
Solid State Communications, 1984
Abstract Raman scattering experiments on CdI2 at high sensitivity give evidence of several new lines in addition to well known ones. The measurements performed at different temperatures allow us to distinguish between one phonon spectrum and two phonon one. The assignment of the new lines associated to one phonon scattering is also discussed.
F. Lévy +3 more
openaire +2 more sources
Abstract Raman scattering experiments on CdI2 at high sensitivity give evidence of several new lines in addition to well known ones. The measurements performed at different temperatures allow us to distinguish between one phonon spectrum and two phonon one. The assignment of the new lines associated to one phonon scattering is also discussed.
F. Lévy +3 more
openaire +2 more sources
Solid State Communications, 1979
Abstract We report the first order Raman spectra of a one-dimensional semiconducting compound ZrS 3 at 300 and 77 K. Four phonons have been detected and associated with the crystal's symmetry.
J.Y. Harbec +2 more
openaire +2 more sources
Abstract We report the first order Raman spectra of a one-dimensional semiconducting compound ZrS 3 at 300 and 77 K. Four phonons have been detected and associated with the crystal's symmetry.
J.Y. Harbec +2 more
openaire +2 more sources
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.
I. Lefkowitz, L. C. Bobb, L. Muldawer
openaire +2 more sources
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.
I. Lefkowitz, L. C. Bobb, L. Muldawer
openaire +2 more sources
Journal of Polymer Science Part A: General Papers, 1965
AbstractExperimental techniques for the measurements of the Raman spectra of crystalline high polymers have been developed. The preparation of samples and a procedure for the measurements are described in some detail. The Raman spectra of polyoxymethylene (CH2O)n, deuterated polyoxymethylene (CD2O)n, poly(ethylene oxide) (CH2CH2O)n, and ...
Hiroyuki Tadokoro +3 more
openaire +2 more sources
AbstractExperimental techniques for the measurements of the Raman spectra of crystalline high polymers have been developed. The preparation of samples and a procedure for the measurements are described in some detail. The Raman spectra of polyoxymethylene (CH2O)n, deuterated polyoxymethylene (CD2O)n, poly(ethylene oxide) (CH2CH2O)n, and ...
Hiroyuki Tadokoro +3 more
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources