title: [Calculation of the portion of free water molecules in water solutions by means of spectral analysis].
abstract: In this paper we present the results of spectral studies of water solutions and water at different temperatures. The calculation method for estimation of the portion of free water molecules is offered. The method is based on the analysis of transmissions spectra features in the terahertz region. The calculation using the proposed method shows that the portion of free water molecules at room temperature ranges from 10 to 16% for a variety of water solutions. In case of pure water, the temperature increase from 20 to 50 degrees C results in the increase of the free molecule fraction from 12% to 19%. Moreover, the increase in the number of free water molecules within a specified temperature range exhibits significant nonuniformity: the most intense growth was observed in the range of 30-40 degrees C. This is particularly interesting because this temperature range includes the optimum temperatures for the existence of warm-blooded animals.
authors.forename: N V
authors.initials: NV
authors.lastname: Pen'kov
authors.forename: N E
authors.initials: NE
authors.lastname: Shvirst
authors.forename: V A
authors.initials: VA
authors.lastname: Iashin
authors.forename: E E
authors.initials: EE
authors.lastname: Fesenko
mesh_terms: D000818:Animals; D055592:Biophysical Phenomena; D056004:Molecular Dynamics Simulation; D012996:Solutions / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D012996:Solutions; D014867:Water