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Abstract <p>The spin selectivity of the processes occurring in vapor above the surface of boiling water has been experimentally demonstrated. This selectivity leads to a significant increase in the fraction of <i>ortho</i>-H<sub>2</sub>O molecules in vapor. An increase in the relative content of <i>ortho/para</i>-isomers of water from the equilibrium value of 3 : 1 (determined by quantum statistics) to 5 : 1 was observed. The content of H<sub>2</sub>O spin isomers in vapor above the water surface was analyzed using a tunable diode laser. Spectral analysis of the <i>ortho</i>- and <i>para</i>-H<sub>2</sub>O content was performed using the absorption lines of these molecules belonging to the vibrational–rotational band 101-000 and having transition frequencies of 7355.557 and 7354.599 cm<sup>–1</sup>, respectively. When water is heated from room temperature (20°C) to the second boiling phase (~80°C), a ratio of <i>ortho</i>- and <i>para</i>-spin isomers of ~3 : 1 was observed, which is typical of normal conditions. During the second and third boiling phases (80–90°C), the <i>ortho</i>/<i>para</i> ratio increases to 5:1. A possible mechanism for increasing the fraction of <i>ortho</i>-H<sub>2</sub>O in the vapor formed during boiling may be associated with the depletion of the equilibrium mixture in the <i>para</i>-H<sub>2</sub>O isomer, due to its higher activity in condensation and formation of water microdrops, dimers, and trimers.</p>

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Increase in the Relative Content of ortho-Н2О Molecules in Vapor above Boiling Water

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • E. V. Stepanov,
  • S. M. Pershin

摘要

Abstract

The spin selectivity of the processes occurring in vapor above the surface of boiling water has been experimentally demonstrated. This selectivity leads to a significant increase in the fraction of ortho-H2O molecules in vapor. An increase in the relative content of ortho/para-isomers of water from the equilibrium value of 3 : 1 (determined by quantum statistics) to 5 : 1 was observed. The content of H2O spin isomers in vapor above the water surface was analyzed using a tunable diode laser. Spectral analysis of the ortho- and para-H2O content was performed using the absorption lines of these molecules belonging to the vibrational–rotational band 101-000 and having transition frequencies of 7355.557 and 7354.599 cm–1, respectively. When water is heated from room temperature (20°C) to the second boiling phase (~80°C), a ratio of ortho- and para-spin isomers of ~3 : 1 was observed, which is typical of normal conditions. During the second and third boiling phases (80–90°C), the ortho/para ratio increases to 5:1. A possible mechanism for increasing the fraction of ortho-H2O in the vapor formed during boiling may be associated with the depletion of the equilibrium mixture in the para-H2O isomer, due to its higher activity in condensation and formation of water microdrops, dimers, and trimers.