Comparative study on the excitation mechanism of chromium emission lines in the argon radio-frequency inductively-coupled plasma, nitrogen microwave induced plasma, and argon or nitrogen glow discharge plasmas

Kazuaki Wagatsuma, Yûetsu Danzaki, Taketoshi Nakahara

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Boltzmann plots of both atomic and ionic chromium emission lines are investigated to compare the excitation mechanisms in four different plasmas: an argon inductively-coupled plasma (Ar-1CP), a nitrogen high-power microwave induced plasma (N2-MIP), an argon glow discharge plasma (Ar-GDP), and a nitrogen glow discharge plasma (N2-GDP). The plots of the atomic lines and the ionic lines give both linear relationships as well as similar excitation temperatures in the case of the Ar-ICP, the N2-MIP, and the N2-GDP. It implies that a thermodynamic process such as electron collision would control their excitations. However, only in the case of the ionic-line plot in the Ar-GDP, a departure from linear relationship is observed and the estimated excitation temperature is rather higher than that with the atomic lines, meaning that a specific excitation mechanism exists in the Ar-GDP. A possible explanation for these results is that a charge-transfer collision between chromium atom and argon ion plays a dominant role in exciting highly-lying energy levels of chromium ion, especially in the Ar-GDP.

Original languageEnglish
Pages (from-to)99-115
Number of pages17
JournalSpectroscopy Letters
Volume36
Issue number1-2
DOIs
Publication statusPublished - 2003

Keywords

  • Argon glow discharge plasma
  • Argon inductively coupled plasma
  • Boltzmann plot
  • Charge-transfer collision
  • Chromium
  • Excitation mechanism
  • Nitrogen glow discharge plasma
  • Nitrogen microwave induced plasma

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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