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<p>We describe the application of laser-induced fluorescence (LIF) spectroscopy in the context of neutral gas characterization in RIT-type gridded ion engines. The experiments were carried out using a xenon-driven gridded radiofrequency ion source. Two LIF transition schemes (laser excitation at 820.6 nm and 823.2 nm, wavelengths in air) targeting metastable states were used to probe the xenon neutral gas species inside the ion source discharge chamber as well as in the near-field plume region. By adjustment of the ion source operating conditions, a variation of the peak-signal Doppler shift was induced in LIF spectra recorded in the plume region with axial-laser injection. This feature is attributed to the speed of the neutrals effusing through the ion extraction optics which eventually allows for estimation of the neutral gas temperature without direct optical access to the discharge chamber.</p>

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Xenon neutral gas characterization in a gridded radiofrequency ion source using laser-induced fluorescence spectroscopy targeting metastable states

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月5日

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  • Lukas Pietzonka,
  • Christoph Eichhorn,
  • Frank Scholze,
  • Daniel Spemann

摘要

We describe the application of laser-induced fluorescence (LIF) spectroscopy in the context of neutral gas characterization in RIT-type gridded ion engines. The experiments were carried out using a xenon-driven gridded radiofrequency ion source. Two LIF transition schemes (laser excitation at 820.6 nm and 823.2 nm, wavelengths in air) targeting metastable states were used to probe the xenon neutral gas species inside the ion source discharge chamber as well as in the near-field plume region. By adjustment of the ion source operating conditions, a variation of the peak-signal Doppler shift was induced in LIF spectra recorded in the plume region with axial-laser injection. This feature is attributed to the speed of the neutrals effusing through the ion extraction optics which eventually allows for estimation of the neutral gas temperature without direct optical access to the discharge chamber.