Abstract
Depolarized Raman spectra below 250 cm −1 in liquid water (H 2O, D 2O and H 2 18O), aqueous electrolyte solutions (LiCl, NaCl, KCl, RbCl, MgCl 2 and CaCl 2), d-glucose solution and ascorbic acid isomerism solutions ( l-xylo and d-arabo) were investigated. The Raman spectra below 250 cm −1 in these liquids are interpreted with a superposition of two damped harmonic oscillators and one Debye type relaxation mode (liquid water) or one Cole-Cole type relaxation mode (aqueus solutions). (1) With increasing temperature the half width of half maximum of the central component g 1 in H 2O has a small bend at about 20°C. (2) For aqueous electrolyte solutions, with increasing salt concentration the ratio of relaxation time τ/τ water shows just the same behavior as the ratio of viscosity η/η water. (3) In glucose solution the characteristic frequencies of two oscillator modes do not show any change. This means that the glucose can just embed in the dynamical structure of water. (4) The effect of L-xylo ascorbic acid (Vitamin C) on the dynamical structure of water is different from the effect of D-arabo ascorbic acid.
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