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Solutions of LiCl and of NaCl in ultrapure water were studied throughRayleigh/Brillouin scattering as a function of the concentration (molarity, M)of dissolved salt from 0.2M to extremely low concentration (2.10^-17 M ). TheLandau-Placzek ratio, R/B, of the Rayleigh scattering intensity over the totalBrillouin, was measured thanks to the dynamically controlled stability of theused Fabry-Perot interferometer. It was observed that the R/B ratio follows twostages as a function of increasing dilution rate: after a strong decreasebetween 0.2M and 2.10^-5 M, it increases to reach a maximum between 10^-9 M and10^-16 M. The first stage corresponds to the decrease of the Rayleighscattering by the ion concentration fluctuations with the decrease of saltconcentration. The second stage, at lower concentrations, is consistent withthe increase of the Rayleigh scattering by long-lived sub-microscopic bubbleswith the decrease of ion concentration. The origin of these sub-microscopicbubbles is the shaking of the solutions which was carried out after eachcentesimal dilution. The very long lifetime of the sub-microscopic bubbles andthe effects of aging originate in the electric charge of bubbles. The increaseof R/B with the decrease of the low salt concentration corresponds to theincrease of the sub-microscopic bubble size with the decrease of concentration,that is imposed by the bubble stability due to the covering of the surfacebubble by negative ions.

Long-lived submicrometric bubbles in very diluted alkali halide water solutions