Spontaneous Raman scattering in mixtures of light and heavy water

Abstract

The registration of spectra (in the range 10–4000 cm−1) of spontaneous Raman scattering in protium and deuterium water, as well as in its mixtures, is reported. The mixtures were prepared with different volume ratios of light and heavy water (from 5:1 to 1:9). As a result of taking into account the Bose factor in the low‐wavenumber region, bands corresponding to the cluster translational modes of water were found. A change in the Raman shift of cluster modes depending on the isotopic composition of a mixture of liquids was recorded. In the wavenumber range 1000–1700 cm−1, the manifestation of deformation modes of H2O, D2O, and HOD molecules was found in the Raman spectra. Stretching vibrations of mixtures of light and heavy water correspond to the wavenumber range of 2000–4000 cm−1. The obtained dependences of the scattered radiation intensity were used to construct difference spectra, which made it possible to determine the content of D2O molecules in light water. The presented experimental results are of interest for diagnosing the presence of deuterium water in the biosphere and for analyzing nonlinear optical processes in water.

A zwitterionic hydrogel with a surprising function of increasing the ionic conductivity of alkali metal chloride or sulfuric acid water-soluble electrolyte

“…2d-f and 3, the characteristic peak at approximately 1200 cm −1 can be observed in hydrogels containing MPC units but cannot be observed in PH aerogels, PH hydrogels and solutions, which may belong to the bending vibration of water forming a unique ice-like clathrate around MPC, as reported by K. Ishihara. 27 This bending vibration is consistent with the bending vibration position of D 2 O reported in the literature, indicating that the water molecules in this unique ice clathrate may produce bending vibration consistent with D 2 O water, 41 but the reason for this consistency is still unclear. This unique ice-like clathrate structure may affect the hydration state of ions, so hydrogel electrolytes containing MPC units possess higher ionic conductivity than water-soluble electrolytes.…”

tMCR‐ALS method for the determination of water concentration profiles in the stratum corneum of untreated and treated skin in vivo

“…[ 31 ] A limitation is the superposition of the Amide I band (1650 cm −1 ) and the water‐related band around 1640 cm −1 (Figure 1). [ 44 ] The AUC 1650 was measured to be around 0.014 of the AUC 3350–3550 and could be adjusted. [ 31 ] Some of the cosmetic formulations (for instance, vegetable oils) have a Raman band around 1650 cm −1 , which should be taken into consideration for correct calculations.…”

Ambient temperature-prepared BiOBr-supported zero-pretreatment coal gasification fine slag for organic pollutant removal

“…30 The peaks at 1622 and 3430 cm À1 are corresponding to the O-H bond. 31 CGFS shows a peak at 1090 cm À1 (C-O). 32 The peak at 512 cm À1 is due to the Bi-O bond, while the peaks at 1622 and 3430 cm À1 in the BOB spectra are ascribed to the O-H bond.…”