Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session DW1: Green Plasma Science & Technology I
8:00 AM–9:30 AM,
Wednesday, October 5, 2022
Sendai International Center
Room: Tachibana
Chair: Gerard Van Rooij, Maastricht University
Abstract: DW1.00003 : The energy cost of N2 dissociation in a microwave discharge: combining modeling and experiments
8:45 AM–9:00 AM
Presenter:
Margherita Altin
(Maastricht University)
Authors:
Margherita Altin
(Maastricht University)
Pedro Viegas
(Instituto Superior Técnico - Universidade de Lisboa)
Luca Vialetto
(Kiel University)
Alex W van de Steeg
(DIFFER)
Savino Longo
(Università degli Studi di Bari)
Gerard J Van Rooij
(Maastricht University)
Paola Diomede
(Maastricht University)
A self-consistent 0D global model of plasma core is developed for this purpose, including the novel Fokker-Planck approach to describe N2 vibrational kinetics. Simulated values of gas, vibrational and electron temperature, and electron density are compared with experimental results, obtained through in-situ laser scattering diagnostics in the pressure range between 50 and 400 mbar, yielding good agreement.
Dissociation is shown by the simulations to be mostly reliant on the reaction N2(X,v) + N2(A) → N2(v=0) + N + N, and hence is strongly dependent on the population of vibrational levels. Investigation at p < 100 mbar reveals that low power density (< 120 W/cm3) limits vibrational excitation , resulting in an energy cost per atom of about 200 eV/atom. At p ≥ 100 mbar, partial contraction of the discharge allows power density in the core to increase up to 1000 W/cm3 at 400 mbar, allowing Tv to increase up to 8000 K and reducing the energy cost per atom to 100 eV/atom.
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