Rayleigh scattering, depolarized

Conde O, Teixerira JJ. Hydrogen bond dynamics in water studied by depolarized Rayleigh scattering. Physics 1983 44 525-529. 

The processes observed in the depolarized Rayleigh spectrum correspond to internal modes of motion. Thus, they may have relaxation times which substantially exceed those obtained from the longitudinal or bulk relaxation alone. Nevertheless they are a part of the a relaxation process as it is normally observed in the creep compliance. All processes with the same shift factors make up the full a relaxation. In liquids with substantial depolarized Rayleigh scattering the slowly relaxing part of the W scattering is also dominated by the orientation fluctuations associated with the internal modes of motion. Each internal mode contributes some intensity, but it is believed that fairly short wavelength modes dominate the scattered intensity. 

A measurement of the Kerr relaxation times in succinoni-trile(SN)as a function of temperature is shown in Fig. 2. The Kerr relaxation times measured show the effect of temperature on the rotational motion of the SN molecules as they undergo a change from the liquid to the plastic crystal phase. The data obtained from the Kerr gate measurement is shown along with a best fit curve from depolarized Rayleigh scattering (dotted line), and a best fit curve from dielectric relaxation measure-... 

Bauer DR, Braumann JI, Pecora R. Depolarized Rayleigh scattering and orientational relaxation of molecules in solution. IV. Mixtures of hexafluorobenzene with benzene and mesitylene. I Chem Phys 1975 63 53-60. 

Danninger W, Zundel G. Reorientational motion and orientational correlation functions in weakly associated organic liquids by depolarized Rayleigh scattering. Chem Phys Lett 1982 90 69-75. 

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. 

Bauer DR, Alms GR, Braumann JI, Pecor R. Depolarized Rayleigh scattering and 13C NMR studies of anisotropic molecular reorientation of aromatic compounds in solution. J Chem Phys 1974 61 2255-2261. 

We shall show that two of these parameters are enough to describe the H-bond dynamics ( Thb and pg, for example). We shaU be able to calculate these two parameters from experimental data (density and depolarized Rayleigh scattering at various temperatures) and to compare the predictions of our theory with the observed diffusional properties of water. Moreover, it will become clear that the assumption of a discrete variable i) essentially means... 

The hydrogen bond lifetime tjq, a fundamental parameter in our picture for water, has also been considered by other authors, some of whonf suggested the use of depolarized Rayleigh scattering eiqiaiments to measure this quantity. The observed frequency spectrum consists of two distinct Lorentzians, the linewidth of the broader one being interpreted by these authors as the inverse of Tiq. 

It is to be presumed that by using formulae (227)—(231) in determining the optical anisotropy of molecules of the solute, better agreement can be obtained between the optical anisotropy values derived by the method of Le Fevre et al. - from studies of the static Kerr effect and those derived by the method of Pacault, Bothorel, et al. - from intensity-depolarized Rayleigh scattering. Also, the latest measurements of the optical Kerr effect point to the possibility of achieving such agreement. 

M. Moraldi, A. Borysow, and L. Frommhold. Depolarized Rayleigh scattering in normal and para-hydrogen. J. Chem. Phys., 55 5344-5351 (1988). 

H. Versmold. Depolarized Rayleigh scattering Molecular reorientation of COj in a wide density range. Molec. Phys., 43 383-395 (1981). 

T. Keyes and B. M. Ladanyi. The relation of the Kerr effect to depolarized Rayleigh scattering. Molec. Phys., 57 1643-1647 (1979). 

D. A. Jackson and B. Simic-Glavaski. Study of depolarized Rayleigh scattering in liquid benzene derivatives. Molec. Phys., JS 393-400 (1970). 

R. A. J. Keijser, M. Jansen, V. G. Cooper, and H. F. P. Knaap. Depolarized Rayleigh scattering in carbon dioxide, carbon oxysulfide and carbon disulfide. Physica, S/ S93-600 (1971). 

A. J. C. Ladd, T. A. Litovitz, J. H. R. Clarke, and L. V. Woodcock. Molecular dynamics simulations of depolarized Rayleigh scattering from liquid argon at the triple point. J. Chem. Phys., 72 1759-1763 (1980). 

H. Langer and H. Versmold. Depolarized Rayleigh scattering Orientational correlation functions of acetonitrile and carbon disulfide. Ber. Bunsen Ges, Phys. Chem., 53 510-517 (1979). 

P. A. Madden. The line shape of the depolarized Rayleigh scattering from liquid argon. Chem. Phys. Lett., 47 174-178 (1977). 

P. A. Madden. The depolarized Rayleigh scattering from fluids of spherical molecules. Molec. Phys., 36 365-388 (1978). 

C. J. Montrose, J. A. Bucaro, J. Marshall-Coakley, and T, A. Litovitz. Depolarized Rayleigh scattering and hydrogen bonding in liquid water. 5. Chem. Phys., 60 5025-5029 (1974). 

G. D. Patterson and P. J. Flory. Depolarized Rayleigh scattering and the mean-squared optical anisotropies of n-alkalenes in solution. J. Chem. Soc. Faraday Trans. 2, 65 1098-1110(1972). 

M. Perrot, M. Besnard, J. Lascombe, and M. Bouachir. Orientational and induced depolarized Rayleigh scattering of some anisotropic molecules in their liquid state. Canad. J. Phys., 59 1481-1486 (1981). 

H. Versmold and U. Zimmermann. Depolarized Rayleigh scattering Temperature dependence of molecular reorientation of COj at constant density. Molec. Phys., 50 65-75 (1983). 

T. W. Zerda, X. Song, J. Jonas, B. Ladanyi, and L. Geiger. Experimental and molecular dynamics study of depolarized Rayleigh scattering by Oj. J. Chem. Phys., 87 840-851 (1987). 

F. B. Martin and J. R. Lalanne. Agreement between depolarized Rayleigh scattering and optical Kerr effect induced by 2 S lched laser waves in some liquids. Phys. Rev. A, 4 1275-1278 (1971). 

These equations may also be applicable to the depolarized Rayleigh scattering of cylindrically symmetric small molecules in solution. In such cases one must usually use interferometric detection since the rotation is generally fast enough to give frequency shifts of the order of wavenumbers (see Section 7.8). In such cases the contribution of the translational diffusion coefficient to the I H spectrum is usually negligible. 

Alms, et al. (1973,1974) have performed depolarized Rayleigh scattering and Carbon-13 spin-lattice relaxation-time measurements on solutions of benzene and mesitylene as a function of solvent viscosity. The solvents used were isopentane, cyclooctane,... 

In recent years, experimental investigation of the depolarized Rayleigh scattering of several liquids composed of optically anisotropic molecules has confirmed the existence of a doublet-symmetric about zero frequency change and with a splitting of approximately 0.5 GHz (see Fig. 12.1.1). The existence of this doublet had been predicted on the basis of a hydrodynamic theory several years previously by Leontovich (1941). This theory assumes that local strains set up by a transverse shear wave are relieved by collective reorientation of individual molecules. Later, Rytov (1957) formulated a more general hydrodynamic theory for viscoelastic fluids that reduces to the Leontovich theory in the appropriate limit. The theories of Rytov and Leontovitch are different from the present two-variable theory, in that the primary variable is the stress tensor and not the polarizability. 

In Chapters 7 and 12 it was shown how depolarized Rayleigh scattering can be used to probe molecular rotations in fluids. Measurements of the band shapes of infrared vibra-... 

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