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Abstract <p>The behavior of concentrations of water and oxygen molecules under the influence of a DC glow discharge in mixtures of He (0.5 mbar) + H<sub>2</sub>O (0, 0.1, 0.25 mbar) + O<sub>2</sub> (0, 1, 2, 3 mbar) in a quartz discharge tube at pressures of several millibars and times on the order of hundreds of seconds was investigated. Concentration measurements were carried out using diode laser absorption spectroscopy. A spectrometer with an external resonator and two independent measurement channels operating simultaneously in spectral regions around 760 and 1390 nm was developed. As a result of the experiment, an increase in the volumetric density of water in the discharge was identified. A kinetic 0D model was created, including plasma-chemical reactions occurring both in the volume and on the wall of the discharge tube. On the basis of comparison of experimental and calculated data, it was concluded that the most probable mechanism leading to the increase in the volumetric density of water in the discharge may be the reaction of water molecules adsorbed on the surface with atomic oxygen formed in the discharge from molecular oxygen via dissociation.</p>

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Dynamics of Concentrations of H2O and O2 Molecules in a He + O2 Glow Discharge

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • A. V. Bernatskiy,
  • I. V. Kochetov,
  • V. V. Lagunov,
  • V. N. Ochkin

摘要

Abstract

The behavior of concentrations of water and oxygen molecules under the influence of a DC glow discharge in mixtures of He (0.5 mbar) + H2O (0, 0.1, 0.25 mbar) + O2 (0, 1, 2, 3 mbar) in a quartz discharge tube at pressures of several millibars and times on the order of hundreds of seconds was investigated. Concentration measurements were carried out using diode laser absorption spectroscopy. A spectrometer with an external resonator and two independent measurement channels operating simultaneously in spectral regions around 760 and 1390 nm was developed. As a result of the experiment, an increase in the volumetric density of water in the discharge was identified. A kinetic 0D model was created, including plasma-chemical reactions occurring both in the volume and on the wall of the discharge tube. On the basis of comparison of experimental and calculated data, it was concluded that the most probable mechanism leading to the increase in the volumetric density of water in the discharge may be the reaction of water molecules adsorbed on the surface with atomic oxygen formed in the discharge from molecular oxygen via dissociation.