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• W4206554483 abstract "Time-resolved nitrogen vibrational temperature and translational-rotational temperature in quasi-two-dimensional atmospheric pressure plasma jets sustained by ns pulse and RF discharges in nitrogen / noble gas mixtures are measured by the broadband vibrational CARS. The results indicate a much stronger vibrational excitation in the RF plasma jet, due to the lower reduced electric field and higher discharge power. In a ns pulse discharge in nitrogen/He, nitrogen vibrational temperature is significantly lower compared to that in N₂/Ar, due to the more rapid V-T relaxation of nitrogen by helium atoms. In the RF plasma jets in N₂/Ne and N₂/Ar, the vibrational excitation increases considerably as the nitrogen fraction in the mixture is reduced. The experimental data in the RF plasma jet in N₂/Ar jet are compared with the kinetic modeling predictions. The results indicate that nitrogen vibrational excitation in N₂/Ar plasma jets with a small N₂ fraction in the mixture (several percent) is controlled primarily by electron impact, anharmonic vibration-vibration (V-V) pumping, and vibration-translation (V-T) relaxation by N atoms. In comparison, V-V energy transfer from the vibrationally excited molecules in the first excited electronic state, N₂(A³Σᵤ⁺,v), which are generated primarily by the energy transfer from the metastable Ar atoms, has a minor effect on the vibrational populations of the ground electronic state, N₂(X¹Σg⁺,v). Although the discharge energy fraction going to electronic excitation is significant, the predicted quasi-steady-state N₂(A³Σᵤ+) number density, controlled by the energy pooling and quenching by N atoms, remains relatively low. Because of this, the net rate of N₂(X¹Σg⁺) vibrational excitation by the V-V energy transfer from N₂(A³Σᵤ⁺) is much lower compared to that by the direct electron impact. The results show that atmospheric pressure RF plasma jets can be used as sources of highly vibrationally excited N₂ molecules and N atoms." @default.
• W4206554483 created "2022-01-25" @default.
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• W4206554483 date "2022-01-03" @default.
• W4206554483 modified "2023-09-28" @default.
• W4206554483 title "N2Vibrational Excitation in Atmospheric Pressure Ns Pulse and RF Plasma Jets" @default.
• W4206554483 doi "https://doi.org/10.2514/6.2022-2365" @default.
• W4206554483 hasPublicationYear "2022" @default.
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