Absolute CO number densities measured using TALIF in a non-thermal plasma environment

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Abstract

We report first measurements of time-resolved absolute CO number densities and rotational temperatures in a non-thermal CO 2 plasma environment using TALIF with a nanosecond pulsed laser. Two-photon excitation spectra from the B 1Σ+(v′ = 0) ← X 1 Σ+ (v″ = 0) Q-branch are recorded and fitted to extract rotational temperatures. Absolute number densities are determined from the frequency-integrated excitation spectrum. The plasma under investigation is a pulsed glow discharge operated at a frequency of 60 Hz with an plasma-on time of 5 ms per plasma cycle, 50 mA plasma current and a pressure of 6.67 mbar. CO number densities range from (2.6 ± 0.6) × 10 22 m -3 to (1.2 ± 0.3) × 10 22 m -3, while rotational temperatures range from 370 ± 40 K to 700 ± 70 K at the beginning and end of the plasma-on phase, respectively. Our results show fair agreement with literature data.

Original languageEnglish
Article number115006
JournalPlasma Sources Science and Technology
Volume28
Issue number11
DOIs
Publication statusPublished - 7 Nov 2019

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Keywords

  • absolute number densities
  • carbon dioxide plasma
  • carbon monoxide
  • glow discharge
  • rotational temperatures
  • two-photon absorption laser-induced fluorescence

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