Raman scattering, depolarized

Raman scattering depolarization of fluorescence Spin-rotation relaxation time... 

Raman scattering depolarization of fluorescence u, unit vector along molecular transition dipole ... 

Raman scattering activities (A 4/AMU), Raman depolarization ratios. 

It is important from a practical viewpoint to predict the shear viscosity of mixtures from those of pure melts. For alkali nitrate melts, a linear dependence has been found between the reorientational line width obtained by Raman measurements and the ratio of temperature divided by shear viscosity.For NO3 ions, the depolarized Raman scattering from 1050cm" total stretching vibrational mode (Al) has a contribution to the line width L, which is caused by the reorientational relaxation time of the Csv axis of this ion. The Stokes-Einstein-Debye(SED) relation establishes a relation between the shear viscosity r of a melt and the relaxation time for the reorientation of a particle immersed in it ... 

A review article has been published on depolarized Raman spectroscopy in molten salts, and it is discussed briefly here for the case of molten nitrates. Polarized (VV) and depolarized (HV) Raman scattering of the 1050 cm" line was used. The intensity of the isotropic part of the... 

Vibrational Raman Scattering of radiation with changed frequency due lo polarizability change during a vibration (A = visible usually) Qualitative for large molecules 10-Ms 10 Pa (100 ion) (v dependent) Useful for characterization. Some structural information from number of bands, position, depolarization ratios, and possibly Isotope effects. All... 

Raman scattering activities (A 4 /AMU), Raman depolarization ratios, reduced masses (AMU), force constants (mDyne/A) and normal coordinates ... 

For a purely isotropic Raman scattering tensor, the depolarization ratio will be zero since the scattered light from such a system must have a polarization parallel to the incident beam. This is evident when equation equation (5.29) is used in equation (5.30) so that [21],... 

In resonance Raman scattering (ga 0), it is possible to have pp >. For example, if ctxy — —ctyx and the remaining off-diagonal elements are zero, g° = gs = 0 and ga 0. Then, (1-49) gives pp —> oo. This is called anomalous (or inverse) polarization (abbreviated as ap or ip). As will be shown in Section 1.15, resonance Raman spectra of metallopophyrins exhibit polarized (Aig) and depolarized (B g and B ) vibrations as well as those of anomalous (or inverse) polarization () ... 

Patterson GD, Griffiths JE. Raman and depolarized Rayleigh scattering in the liquid state reorientational motions and correlations in orientation for symmetric top molecules. J Chem Phys 1975 63 2406-2413. 

Cheung CK, Jones DR, Wang CH. Single particle reorientation and pair correlations of methyl iodide solutions studied by depolarized Rayleigh and Raman scattering. J Chem Phys 1976 64 3567-3572. 

The differential Raman scattering cross sections and depolarization ratios in the Fermi resonance region of carbon disulphide CS2 were measured and interpreted in terms of three bond polarizability parameters and the cubic force constant k 22 (Montero et al., 1984). 

The depolarization ratio in Raman scattering has no true counterpart in IR absorption. However, the dipole moment is... 

Type of Raman scattering Vibrational band character Polarizability tensor symmetry Depolarization ratio... 

Kaminow and Damen, for example, observe depolarized Raman scattering from KH2PO4. The bandshape is fitted within experimental error at each temperature by a susceptibility... 

In the present study, an instmment has been established for polarized and depolarized Raman scattering measurement of supercritical fluid along its isotherm to realize the investigations stated above. Preliminary results for supercritical CF3H are given to draw a schematic picture of the dynamics. 

Berweger S, Raschke MB (2010) Signal limitations in tip-enhanced Raman scattering the challenge to become a routine analytical technique. Anal Bioanal Chem 396(1) 115-123 Motohashi M, Hayazawa N, Tarun A, Kawata S (2008) Depolarization effect in reflectionmode tip-enhanced Raman scattering for Raman active crystals. J Appl Phys 103(3) 034309 85. Neacsu CC, Dreyer J, Behr N, Raschke MB (2006) Scanning-probe Raman spectroscopy with single-molecule sensitivity. Phys Rev B 73(19) 193406... 

Polarized analysis There is useful spectral information arising from the analysis of polarization of Raman scattered light. This, typically called as polarized analysis, provides an insight into molecular orientation, molecular shape, and vibrational symmetry. One can also calculate the depolarization ratio. Overall, this technique enables correlation between group theory, symmetry, Raman activity, and peaks in the corresponding Raman spectra. It has been applied successful for solving problems in synthetic chemistry understanding macromolecular orientation in crystal lattices, liquid crystals or polymer samples and in polymorph analysis. 

Depolarized Raman scattering from amorphous solids have recently been considered [649, 651], and a formalism for the interpretation of the Raman spectra of disordered solids has been proposed [648]. Raman scattering in other molecular crystals have also been reported [629, 637, 641, 646]. 

M. Fairbanks, R. L. McGreevy, and E. W, J. Mitchell. Depolarization ratios for Raman scattering from molten alkali and alkali-earth halides. J. Phys. Chem., 79 L53-L58 (1986). 

J. Schroeder and J. Jonas. Density effects on depolarized Raman scattering in liquids. Chem. Phys., 54 11-16(1978). 

G. Signorelli, V. Mazzacurati, M. Nardone, and C. Pona. Depolarized Raman Scattering from Disordered Systems. In J. van Kranendonk (ed.), Intermolecular Spectroscopy and Dynamical Properties of Dense Systems—Proceedings of the International School of Physics "Enrico Fermi," Course LXXV, North-Holland, Amsterdam, 1980, pp. 294-306. 

A knowledge of the frequency-dependent polarizability functions and their gradients allows the Raman scattering cross sections and depolarization ratios... 

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