Light scattering spectroscopy of pure fluids

Patterson, G. D.; Carroll, P

doi:10.1021/j100254a008

Cited by 18 publications

(5 citation statements)

References 3 publications

(4 reference statements)

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“…To estimate this effect for water it is most convenient to express the hyperpolarizability tensor as the sum of irreducible spherical tensors. In the static limit one has ␤ϭ␤ (1) ϩ␤ (3) , where ͉␤ (1) ͉ 2 ϭ(5/3)(␤ ʈ ) 2 and ͉␤ (3) ͉ 2 ϭ(1/10)(2A ϪBϪC) 2 ϩ(1/6)(BϪC) 2 , and for water ͉␤ (1) ͉ 2 /͉␤ (3) ͉ 2 Ϸ5. The transformation of ␤ (1) under rotations is the same as for the molecular dipole.…”

Section: T ͑°C͒mentioning

confidence: 99%

“…Such coupling between shear flow and molecular orientation gives rise to line shape distortions seen in the depolarized Rayleigh scattering spectrum. [1][2][3]39 The LA mode is spectrally unresolved. The deconvolved width is consistent with zero, but a width as large as 0.3 cm Ϫ1 also gives a fit with 2 within the expected range of 2 values for a good fit.…”

Section: T ͑°C͒mentioning

confidence: 99%

“…Light scattering has been used as a tool to investigate the motion of molecules in liquids for almost a century. [1][2][3] The orientational and translational motions of the molecules result in spectral features at small frequency shifts, typically Ͻ100 cm Ϫ1 . The most prominent feature of the polarized scattered light spectrum is the Rayleigh-Brillouin triplet due to diffusive and propagating ͑longitudinal acoustic͒ density fluctuations of the fluid.…”

Section: Introductionmentioning

confidence: 99%

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Collective molecular rotation in D2O

Shelton

2002

The Journal of Chemical Physics

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The hyper-Rayleigh scattering ͑HRS͒ spectrum of liquid D 2 O was measured at 90°scattering angle with linearly polarized light ͑VV, HV, VH, and HH polarization geometries͒. The VV and HV spectral profiles are similar, but the HV and VH spectral profiles are very different. This can be accounted for by scattering from nonlocal modes of molecular reorientation. The local mode and the transverse nonlocal mode both result in Lorentzian spectral components with width increasing from 1.1 cm Ϫ1 at Tϭ23°C to 3.3 cm Ϫ1 at 80°C. The spectrum due to the longitudinal nonlocal mode has width Ͻ0.3 cm Ϫ1. A relatively weak and very broad collision-induced spectral component is also observed. The relative integrated intensities of the local, transverse and longitudinal components of the VH HRS spectrum are 21%, 45%, and 34%, indicating that molecular reorientation in water is predominantly a collective effect.

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Section: T ͑°C͒mentioning

confidence: 99%

Section: T ͑°C͒mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Collective molecular rotation in D2O

Shelton

2002

The Journal of Chemical Physics

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“…However, the compressional sound waves (longitudinal acoustic phonons) observed in Brillouin spectroscopy are widely recognized collective modes of molecular motion in liquids [3], and linear light scattering experiments have also observed shear waves (transverse acoustic phonons) in viscous liquids [4]. Furthermore, the polar vibrational excitations in molecular fluids have been shown by hyper-Raman scattering experiments to have a strongly delocalized character [5].…”

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confidence: 99%

Librons Observed in Liquid Acetonitrile by Hyper-Rayleigh Scattering

Shelton

Kaatz

2000

Phys. Rev. Lett.

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“…2.19). Οι ανισότροπες διακυμάνσεις της πολωσιμότητας οφείλονται κατά κύριο λόγο στις διακυ μάνσεις προσανατολισμού των μορίων[44,45]. Οι διακυμάνσεις του ανισότρο-…”

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Σκεδαση Φωτος Απο Αλογονιδια Ψευδαργυρου Στην Υγρη Και Υαλωδη Κατασταση

Παυλατου¹

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Photon Correlation Spectroscopy has been applied in order to study the dynamic behavior of structural rearrangements in glassy ZnCI 2 at tempera tures 25-420°C. The structural properties of the glassy systems ZnCI 2 -ZnBr 2 and liquid ZnCI 2 -ACI (A=Li, Cs) have been studied by Raman spectroscopy in the range 25-700°C.The autocorrelation functions of scattered light of pure ZnCI 2 indicate the existence of two at least relaxation processes occurring near Τ The first "main" process is attributed to local density fluctuations and is very well represented by the KWW equation, exp(-t/i)ß, with ß=0.706±0.012 insensitive to temperature variations in the region T g ->T g +80-^C. The high value of ß(ß-»1 ) categorizes ZnCI 2 in the class of relative "strong" glasses, with an nearly Arrhenius temperature dependence of relaxation time τ through T g -^T m +200°C. The second "slow" process could be tentatively attributed to "slow" motions of large "clusters" formed in the 3D-network structure.The temperature dependence of reduced Raman spectra of pure ZnX 2 (X=CI, Br) indicates the presence of different bonding states in the "network" structure, where halogen atom sharing of the ZnX 4 tetrahedral groups occurs. Furthermore, at elevated temperatures the "network" breaks up, creating ZnX 3 units. The spectra of binary ZnCI 2 -ZnBr 2 system show that the mixtures are formed by random closest packing of X atoms. In the ZnCI 2 -ACI mixtures the breaking of the "network" structure occurs both with increasing temperature and AGI composition. The tetrahedral structure around Zn is preserved but one, three of four "terminal" atoms X are formed in the melt with A+ as nearest neighbors.

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Light scattering spectroscopy of pure fluids

Cited by 18 publications

References 3 publications

Collective molecular rotation in D2O

Collective molecular rotation in D2O

Librons Observed in Liquid Acetonitrile by Hyper-Rayleigh Scattering

Σκεδαση Φωτος Απο Αλογονιδια Ψευδαργυρου Στην Υγρη Και Υαλωδη Κατασταση

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