Mandelstam-Brillouin scattering spectra of aqueous solutions of γ-picoline and manifestation of a phase transition of the structural type in these spectra at low concentrations of γ-picoline

The frequency shift Δv of the Mandelstam-Brillouin components in an solution of γ-picoline is studied in relation to the temperature t of the solution (in the range 10–80°C) and the concentration x of γ-picoline (x < 0.1 ppm). The following specific features of the behavior of the quantity Δv are observed: (i) an inversion of the sign of the temperature coefficient of the dependence Δv(t) with a change in the concentration of the solution and (ii) the occurrence of two maxima on the isotherms of the dependence Δv(x), which behave significantly differently with the solution temperature and concentration. These experimental results are discussed from the viewpoint of the manifestation of a phase transition of the structural type in these spectra at small concentrations of γ-picoline in water.

Перевод пока недоступен