Abstract
Depolarized low-frequency Raman spectra of aqueous solutions of L-ascorbic acid and its isomer D-araboascorbic acid as a function of concentration have been investigated in the frequency region from -250 cm -1 to 250 cm -1 at 30°C. The reduced χ ′′ (\barν) spectrum, which corresponds to the imaginary part of the dynamical susceptibility, due to the dynamical structure of water in aqueous solutions, was analyzed with the superposition of one Cole-Cole-type relaxation mode and two damped harmonic oscillator modes. The effect of L-ascorbic acid on the dynamical structure of water is different from the effect of D-araboascorbic acid.
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