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Д.Гранин "Искатели"

on 05 Январь 2012. Posted in О воде

Temperature Evolution of the Relative Concentration of the H2O Ortho/Para Spin Isomers in Water Studied with Four-Photon Laser Spectroscopy *

Pershin S.M., Bunkin A.F. pdf

Wave Research Center, Prokhorov General Physics Institute, Russian Academy of Sciences

Abstract. The four-photon laser spectroscopy of molecular motions [1] of distilled water in the terahertz and subterahertz spectral ranges is employed to observe resonant lines related to the rotational transitions of ortho and para nuclear spin isomers of the H2O molecule. It is demonstrated that the intensity ratio of the lines of the H2O ortho/para spin isomers in several water samples decreases by a factor of 2–2.5 in comparison with the gas-phase ratio. A violation of the equilibrium ortho/para ratio upon the condensation of vapor is interpreted as a manifestation of the spin selectivity in the formation of the H-bonded complexes of the H2O para isomers. The nonequilibrium ortho/para ratio characterizes water at room temperature as an unstable liquid with respect to the spin temperature.


*Laser Physics, 2009, Vol. 19, No. 7, pp. 1–5.


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