Raman scattering spectra recorded in the course of the water–ice phase transition and laser diagnostics of heterophase water systems

Glushkov, S. M.; Panchishin, I. M.; Фадеев, В. В.

doi:10.1070/qe1989v019n04abeh007918

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Further, for liquid water, the isotropic component of the polarized Raman spectrum dominates at 3000−3300 cm -1 , consistent with water in a symmetrical environment. The resonance at 3300−3600 cm -1 is a convolution of at least two resonances: both the OH stretch of water in an asymmetrical environment and the asymmetric stretch of water in a symmetrical environment contribute to this band. ,,, Water in the first layer of the interface necessarily has disrupted tetrahedral bonding; however, due to the similarity to the bulk water hydrogen-bonded spectrum, the following assignments are generally used. The peak at 3700 cm -1 is assigned to an OH stretch free of hydrogen bonding reflecting the disrupted tetrahedral bonding at the surface.…”

Section: Discussionmentioning

confidence: 99%

Effect of H₂SO₄ and Alkali Metal SO₄^2-/HSO₄^- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

et al. 1999

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The surface-specific vibrational spectroscopy, sum frequency generation, has been used to study the structure of water at air/liquid interfaces of inorganic, ionic solutions. The experiments suggest that ions in solution reorient surface water into a more structured, hydrogen-bonded network compared with the neat water/air interface. In more concentrated solutions, there is a high degree of ion association. A model based on Hard Soft Acid Base theory indicates that associated ions are able to penetrate closer to the air interface than unassociated ions. Associated ions incorporate surface water into the ion-pair hydration shell.

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Section: Discussionmentioning

confidence: 99%

Effect of H₂SO₄ and Alkali Metal SO₄^2-/HSO₄^- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

et al. 1999

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“…The technique, as employed has been reported in detail [2]. The first series of experiments was carried out employing a specially developed optical cryogenic technique.…”

Section: A Experimental and Instrumentationmentioning

confidence: 99%

Laser Fluorescence Spectroscopy as a Method for Studying Humic Substance

Filippova

Фадеев

Chubarov

et al. 2001

Applied Spectroscopy Reviews

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This paper summarizes the results obtained by fluorescence spectroscopic techniques with conventional and laser light sources for the characterization of the spectral luminescent properties of aquatic humic substances (AHS). The band profiles of corrected absorption, fluorescence emission, and fluorescence excitation spectra are compared in graphical form with unique functions used for the axes. In order to calculate the quantum efficiency of fluorescence, we used the Raman signal from water molecules as an internal reference. The temperature dependence of the fluorescence spectra of humic matter has been recorded in solid (−160°C to 0°C) and in liquid (0°C to +300°C) aqueous solutions. The behavior of the fluorescence band shape is discussed. A new method of nonlinear fluorimetry is proposed to enhance the capabilities of fluorescence spectroscopy. This method is based on the ORDER REPRINTS 88FILIPPOVA ET AL.fluorescence saturation effect manifesting itself under powerful laser pumping (excitation) conditions. The use of the technique allows one to determine certain photo-physical properties of molecules, as a complement to the normal spectral data. Using three different samples of aquatic humic substances with very similar fluorescence band shapes, it is demonstrated that these compounds have distinct molecular luminescent parameters and therefore, can be identified. The similarity of the fluorescence band shapes of humic substances in natural water of different types; the absence of any noticeable effect of temperature across a wide range and the fluorescence saturation on the fluorescence band contour can be explained. This assumes that in all of the samples of aquatic humic substances studied, with different molecular weight fractions, that there is a single dominant fluorescent functionality present.

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Optical Determination of the Temperature of Transparent Microparticles

Vehring¹,

Schweiger²

1992

Appl Spectrosc

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We present a noncontact temperature-sensing method for microdroplets of water, which relies on temperature dependence of the OH stretching band of the spontaneous Raman spectrum. Temperatures of freely moving evaporating droplets with mean particle diameters of approximately 35 µm have been measured with an accuracy of ±1°C in the range from 10 to 65°C. The method allows the observation of droplet cooling during the initial unsteady phase of evaporation.

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Raman scattering spectra recorded in the course of the water–ice phase transition and laser diagnostics of heterophase water systems

Cited by 3 publications

References 2 publications

Effect of H₂SO₄ and Alkali Metal SO₄^2-/HSO₄^- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

Effect of H₂SO₄ and Alkali Metal SO₄^2-/HSO₄^- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

Laser Fluorescence Spectroscopy as a Method for Studying Humic Substance

Optical Determination of the Temperature of Transparent Microparticles

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Raman scattering spectra recorded in the course of the water–ice phase transition and laser diagnostics of heterophase water systems

Cited by 3 publications

References 2 publications

Effect of H2SO4 and Alkali Metal SO42-/HSO4- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

Effect of H2SO4 and Alkali Metal SO42-/HSO4- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

Laser Fluorescence Spectroscopy as a Method for Studying Humic Substance

Optical Determination of the Temperature of Transparent Microparticles

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Product

Resources

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Effect of H₂SO₄ and Alkali Metal SO₄^2-/HSO₄^- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation

Effect of H₂SO₄ and Alkali Metal SO₄^2-/HSO₄^- Salt Solutions on Surface Water Molecules Using Sum Frequency Generation