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@article{1829612,
author = {van de Steeg, Alex and Vialetto, Luca and Sovelas da Silva, Ana Filipa and Arsénio Nunes Aleixo Viegas, Pedro and Diomede, Paola and van de Sanden, Richard and van Rooij, Gerard},
article_number = {5},
doi = {http://dx.doi.org/10.1021/acs.jpclett.1c03731},
keywords = {Electrical properties; Ionization; Plasma; Power; Electron density},
language = {eng},
issn = {1948-7185},
journal = {The Journal of Physical Chemistry Letters},
title = {The Chemical Origins of Plasma Contraction and Thermalization in CO2 Microwave Discharges},
url = {https://pubs.acs.org/doi/10.1021/acs.jpclett.1c03731},
volume = {13},
year = {2022}
}
TY - JOUR
ID - 1829612
AU - 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
PY - 2022
TI - The Chemical Origins of Plasma Contraction and Thermalization in CO2 Microwave Discharges
JF - The Journal of Physical Chemistry Letters
VL - 13
IS - 5
SP - 1203-1208
EP - 1203-1208
PB - American Chemical Society
SN - 19487185
KW - Electrical properties
KW - Ionization
KW - Plasma
KW - Power
KW - Electron density
UR - https://pubs.acs.org/doi/10.1021/acs.jpclett.1c03731
N2 - 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.
ER -
VAN DE STEEG, Alex, Luca VIALETTO, Ana Filipa SOVELAS DA SILVA, Pedro ARSÉNIO NUNES ALEIXO VIEGAS, Paola DIOMEDE, Richard VAN DE SANDEN and Gerard VAN ROOIJ. The Chemical Origins of Plasma Contraction and Thermalization in CO2 Microwave Discharges. \textit{The Journal of Physical Chemistry Letters}. American Chemical Society, 2022, vol.~13, No~5, p.~1203-1208. ISSN~1948-7185. Available from: https://dx.doi.org/10.1021/acs.jpclett.1c03731.
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