Informace o publikaci

The Chemical Origins of Plasma Contraction and Thermalization in CO2 Microwave Discharges

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VAN DE STEEG Alex VIALETTO Luca SOVELAS DA SILVA Ana Filipa ARSÉNIO NUNES ALEIXO VIEGAS Pedro DIOMEDE Paola VAN DE SANDEN Richard VAN ROOIJ Gerard

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj The Journal of Physical Chemistry Letters
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://pubs.acs.org/doi/10.1021/acs.jpclett.1c03731
Doi http://dx.doi.org/10.1021/acs.jpclett.1c03731
Klíčová slova Electrical properties; Ionization; Plasma; Power; Electron density
Popis Thermalization of electron and gas temperature in CO2 microwave plasma is unveiled with the first Thomson scattering measurements. The results contradict the prevalent picture of an increasing electron temperature that causes discharge contraction. It is known that as pressure increases, the radial extension of the plasma reduces from ~7 mm diameter at 100 mbar to ~2 mm at 400 mbar. We find that, simultaneously, the initial nonequilibrium between ~2 eV electron and ~0.5 eV gas temperature reduces until thermalization occurs at 0.6 eV. 1D fluid modeling, with excellent agreement with measurements, demonstrates that associative ionization of radicals, a mechanism previously proposed for air plasma, causes the thermalization. In effect, heavy particle and heat transport and thermal chemistry govern electron dynamics, a conclusion that provides a basis for ab initio prediction of power concentration in plasma reactors.
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