On the Mechanism of Ionic-Cluster Excitation of Argon Levels in Molecular Gas Mixtures

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Abstract

In this paper, the features of the process of argon radiation mixed with molecular and atomic impurities in condensing supersonic jets are studied experimentally. The mixture particles were activated by a well-focused electron beam. The dependence of the radiation intensity of individual argon lines on the gas-dynamic parameters in the jet is studied by changing the total density of the gas mixture due to changes in the stagnation pressure in the gas source chamber. The anomalous increase in the radiation intensity in a certain pressure range, which is different for different compositions of mixtures, was recorded on individual lines of atomic argon (Ar-I). At the same time, a similar effect was not detected in the spectrum of argon ions (Ar-II). It is established that anomaly was caused by the highly efficient molecular cluster mechanism of selective excitation of individual levels of argon atoms. It is absent in non-condensing jets and weakens at the stage of formation of large clusters. The main channels of energy transmission are discussed. The empirical model of the excitation-radiation process based on the obtained data was proposed.

Original languageEnglish
Pages (from-to)247-265
Number of pages19
JournalPlasma Chemistry and Plasma Processing
Volume42
Issue number1
DOIs
Publication statusPublished - Jan 2022

Keywords

  • Anomalous luminescence
  • Electron-beam excitation
  • Molecular gas mixtures
  • Supersonic clustered argon flows

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 2.05 MATERIALS ENGINEERING
  • 2.04 CHEMICAL ENGINEERING

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