was taken for investigation. Water molecules are able to create molecular associates using Van der Waals forces as well as labile hydrogen interactions [ -]. Owing to hydrogen bonds molecules of water are capable to form not only random associates one having no ordered structure but clusters, i.e. associates having some ordered structure [ -]. The network of hydrogen bonds and the high order of intermolecular cooperativity facilitate long-range propagation of molecular excitations [ , ]. This allows, in principle, to consider water and water-based solutions as systems sensitive to weak external forces. Indeed, the study of luminescence at long time scale shows that the structural equilibrium in water is not stable it changes after dissolution of small portions of added substances and after exposition of aqueous samples to UV and mild X-ray irradiation [ ].

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