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Article Dans Une Revue Plasma Sources Science and Technology Année : 2024

Measurement of the main neutral species densities and temperatures in iodine plasmas using optical absorption techniques

Mesure de la densité et de la température de l'espèce neutre principale dans des plasmas d'iode par des techniques d'absorption optique

Résumé

Iodine is a promising propellant for future plasma thrusters used in space propulsion. It is therefore important to understand the basic physics and chemistry of low-pressure iodine plasmas. In the present work, optical absorption methods are used to measure the densities of iodine molecules, I2 , and iodine atoms, I, the translational temperature of the atoms and the dissociation fraction. The plasma is generated in a long quartz tube by a capacitively coupled RF discharge, and the pressure is varied between a few Pa and a few tens of Pa. The translational temperature of the atom vapour increases both with RF power and with pressure and reaches 1000 K at 50 watts and 25 Pa. The molecules appear to be efficiently dissociated, with a dissociation fraction found above 65 %, on average along the line-of-sight, at 120 watts and 5 Pa. The population of the upper, 2P1/2 , fine-structure level of the atomic ground term is found to be negligible, which confirms the existence of a high quenching rate, due to collisions with molecules and/or atoms. These measurements can be helpful for chemistry models of iodine plasmas.
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Dates et versions

hal-04429627 , version 1 (31-01-2024)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

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Benjamin Esteves, Christophe Blondel, Pascal Chabert, Tanguy Michel, Cyril Drag. Measurement of the main neutral species densities and temperatures in iodine plasmas using optical absorption techniques. Plasma Sources Science and Technology, 2024, 33, pp.1. ⟨10.1088/1361-6595/ad169d⟩. ⟨hal-04429627⟩
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