Raman spectroscopy of supercooled water

Bansil, Rama; Wiafe‐Akenten, J.; Taaffe, J. L.

doi:10.1063/1.443295

Cited by 35 publications

(9 citation statements)

References 11 publications

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“…The I NHB / I HB ratio can be reasonably assumed proportional to the equilibrium constant of HB ↔ NHB; as a consequence, a van't Hoff treatment of these data can give an estimation of the enthalpy change Δ H H of the H-bond of pure water and of water in octanol. We find that the Δ H H value of pure water is 2.40 ± 0.22 kcal mol -1 ; this datum is in good agreement with the literature value (Δ H H ) L of 2.54 ± 0.10 kcal mol -1 found with similar procedures. − The value that we find for water in octanol is still close to (Δ H H ) L even if a bit higher: Δ H H = 3.01 ± 0.30 kcal mol -1 . Despite the approximations assumed in our procedures, the agreement between H-bonding variation enthalphies above-mentioned is a further confirmation of the assignment of the subtraction spectrum to water confined in alcohol.…”

Section: Resultssupporting

confidence: 91%

Water/Alcohol Mixtures: A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

et al. 2004

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The properties of the water-saturated 1-octanol solution in the 10−75 °C temperature range have been investigated by means of different scattering spectroscopies. The results of Raman, depolarized-Rayleigh, and Rayleigh−Brillouin experiments have been compared to the corresponding results recently obtained for the pure alcohol in our laboratory. Spectroscopic findings obtained for the temperature behavior of vibrational, rotational, and translational degrees of freedom are analyzed according to a single, unifying picture of this liquid system. Differences and analogies between pure and water-saturated 1-octanol suggest the key for interpreting the structural properties connected to the amphiphilic nature of n-alcohols. In a wider perspective, the same arguments can be applied to the study of larger and more complicated systems such as phospholipids for which 1-octanol represents a simple model.

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Section: Resultssupporting

confidence: 91%

Water/Alcohol Mixtures: A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

et al. 2004

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“…Basically, below 240 K, water molecules in a supercooled solution form a network of clusters, and the size of such clusters increases with decrease in temperature. A number of spectroscopic studies support the idea of cluster formation in supercooled water [e.g., Bansil et al, 1982;Hare and Soerensen, 1990;Pruppacher, 1995]. From these studies, Pruppacher [1995] recently suggested that the diffusion activation energy of water molecules across the ice/water interface in supercooled water below 240 K should be estimated from the transfer of water clusters across the phase boundary instead of the transfer of single water molecules as formulated previously [Pruppacher, 1972].…”

Section: B ] X!(t Ws) = A(ws)t • Exp T-to(ws) (6)mentioning

confidence: 86%

A model description for cirrus cloud nucleation from homogeneous freezing of sulfate aerosols

Tabazadeh¹,

Jensen²,

Toon³

1997

J. Geophys. Res.

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Abstract. Classical nucleation theory for homogeneous freezing as well as recent laboratory data are used to formulate an algorithm for ice nucleation from an aqueous sulfuric acid solution droplet. A new pammeterized function is derived from re•nt thermodynamic data to express the variation of stflfiafc acid solution composition with temperature and relative humidity. This function is then used to derive critical ice nucleation parameters from recent laboratory data. The critical nucleation parameters are used in a classical nucleation theory to derive the diffusion activation energy of water molecules in a sulfuric acid solution from the measurements. The derived diffusion activation energy of water molecules in a sulfuric acid solution does not agree with the diffusion activation energy calculated from a viscous flow formulation that is commonly used in classical nucleation rate calculations. Our restfits show that ice nucleation in a stdfate droplet occurs when the interface energy of ice against the stdfate solution is approximately 17 dyn cm 4. We calculate that a supersaturation ratio of about 1.3 to 1.5 is required to nucleate ice from an aqueous stdfuric acid solution droplet in the temperature range of about 185 to 240 K. This supersaturation corresponds to a supercooling of a stdfate solution to about 2 to 3 K below the equilibrium condensation point of ice. Simple functions are given for estimating the nucleation point of ice in the upper troposphere. The differences between previous parameterizations and this work are discussect

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“…Vibrational spectroscopy is one of the most widely used methods for obtaining information on materials irrespective of their state, being equally applicable to the study of gases, liquids, crystals, and amorphous solids. − Optical techniques, such as infrared and Raman spectroscopies, and inelastic neutron scattering (INS) are revealed to be ideal tools for the study of the vibrational dynamics. However, it has to be pointed out that INS spectra are different from their optical counterparts for the following reasons:…”

Section: Introductionmentioning

confidence: 99%

Vibrational Studies on Disaccharide/H₂O Systems by Inelastic Neutron Scattering, Raman, and IR Spectroscopy

Branca¹,

Magazù²,

Maisano³

et al. 2003

J. Phys. Chem. B

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Inelastic neutron scattering (INS), Raman scattering, and infrared spectroscopy experiments on pure water and on aqueous solutions of homologous disaccharides, such as trehalose and sucrose, are presented. Neutron spectra were collected by using the spectrometer MARI at the ISIS pulsed neutron source of the Rutheford Appleton Laboratory (Chilton, U.K.). The principal aim of this work is to analyze the structural modifications induced on water by trehalose and sucrose to look for different structural arrangements that can account for their different effectiveness as bioprotectors. Special emphasis was addressed to the intramolecular stretching and bending spectral contributions and to the intermolecular librational mode. A comparison of the INS spectra from pure water with those of homologous disaccharide/water mixtures showed the same peculiar behavior as found in Raman scattering, infrared spectroscopy, and computational results derived from density functional theory (DFT).

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Raman spectroscopy of supercooled water

Cited by 35 publications

References 11 publications

Water/Alcohol Mixtures: A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

Water/Alcohol Mixtures: A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

A model description for cirrus cloud nucleation from homogeneous freezing of sulfate aerosols

Vibrational Studies on Disaccharide/H₂O Systems by Inelastic Neutron Scattering, Raman, and IR Spectroscopy

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Raman spectroscopy of supercooled water

Cited by 35 publications

References 11 publications

Water/Alcohol Mixtures: A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

Water/Alcohol Mixtures: A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

A model description for cirrus cloud nucleation from homogeneous freezing of sulfate aerosols

Vibrational Studies on Disaccharide/H2O Systems by Inelastic Neutron Scattering, Raman, and IR Spectroscopy

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Vibrational Studies on Disaccharide/H₂O Systems by Inelastic Neutron Scattering, Raman, and IR Spectroscopy