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<b>Abstract</b>— <p>Estimates and preliminary experiments have been performed to determine the parameters of a scheme necessary for detecting radiation absorption in a rarefied low-temperature plasma simulating the upper layers of exoplanet atmospheres. Kinetic modeling of the population of the metastable helium level 2<sup>3</sup>S showed that for reliable detection of absorption in the λ = 1083 nm line in the plasma with a temperature of 1–3 eV, an optical path of ~100 m is required. To achieve this, the use of multipass schemes is necessary. The classic Herriott multipass scheme, as well as a new type of diffraction multipass scheme, were tested.</p>

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Justification for a Laboratory Experiment to Measure Absorption in the He I (23S) λ = 1083 nm Line in a Rarefied Low-Temperature Plasma

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • M. P. Golubovsky,
  • M. S. Rumenskikh,
  • A. R. Lotarev,
  • P. A. Statsenko,
  • I. F. Shaikhislamov

摘要

Abstract—

Estimates and preliminary experiments have been performed to determine the parameters of a scheme necessary for detecting radiation absorption in a rarefied low-temperature plasma simulating the upper layers of exoplanet atmospheres. Kinetic modeling of the population of the metastable helium level 23S showed that for reliable detection of absorption in the λ = 1083 nm line in the plasma with a temperature of 1–3 eV, an optical path of ~100 m is required. To achieve this, the use of multipass schemes is necessary. The classic Herriott multipass scheme, as well as a new type of diffraction multipass scheme, were tested.