Energy partitioning in N-2 microwave discharges: integrated Fokker-Planck approach to vibrational kinetics and comparison with experiments

TitleEnergy partitioning in N-2 microwave discharges: integrated Fokker-Planck approach to vibrational kinetics and comparison with experiments
Publication TypeJournal Article
Year of Publication2022
AuthorsM. Altin, L. Vialetto, A.W. van de Steeg, P. Viegas, S. Longo, G.J. van Rooij, P. Diomede
JournalPlasma Sources Science and Technology
Volume31
Issue10
Pagination104003
Abstract

This work investigates energy transfers between electrons, vibrational and translational degrees of freedom and their effect on dissociation mechanisms in a N2 microwave plasma in the pressure range between 50 and 400 mbar. A novel self-consistent 0D plasma chemistry model describing vibrational kinetics via the vibrational energy equation and the Fokker-Planck approach is developed. It is used to simulate conditions achieved experimentally, providing good agreement with measured values of vibrational and gas temperature and electron density. Above 100 mbar, energy efficiency of dissociation increases with power density, due to the significant contribution of collisions between vibrationally excited N2 and electronically excited molecules. Energy transfer to vibrations is maximum at low power density and low pressure due to reduced gas heating.

DOI10.1088/1361-6595/ac93af
Division

MaSF

Department

PSFD

PID87704700d8aa6bf7fdd5623a686b0a1d
Alternate TitlePlasma Sources Sci. Technol.
LabelOA

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