Detection of the OH band fine structure in liquid water by means of new treatment procedure based on the statistics of the fractional moments

Abstract

Three main spectral components ∼ 3210, 3450, and 3650 cm-1 separated by deep gaps in the Raman OH band of liquid water have been detected by a new treatment procedure of experimental data. The applied treatment is based on the statistics of the fractional moments. This approach includes the consideration of the total set of the moments (the fractional and even complex ones) and the generalized mean value functions (GMV) as a specific noise ``label''. The possibility of the extraction and quantitative description of the fine structure of the averaging experimental spectra is demonstrated. In the frame of the novel approach the reliable separation between Raman spectra of the distilled and Milli-Q water is obtained.

Stress-induced traps in multilayered structures

“…46,47,48 This method helps to find the optimal and smoothed trend (the so-called pseudo-fitting function) and separate it from the relative fluctuations.…”

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Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

“…3200 cm −1 is usually assigned to strongly hydrogen-bonded water molecules, or the so-called locally structured water, while the band at 3400 cm −1 is attributed to loosely bonded water molecules. Most of the authors distinguish three [ 15 – 16 ] or four [ 13 ] components of the band in the OH stretching vibration region. Irrespective of how the spectra are deconvoluted, all models of liquid water agree that the lower the frequency of the band, the stronger the hydrogen bonds and water structuration.…”