Nitrogen metastable (N2(A3 Σu+)) in a cold argon atmospheric pressure plasma jet: Shielding and gas composition
Résumé
N2(A3Σ+u) metastable species are detected and measured in a non-equilibrium atmospheric pressure plasma jet by laser induced fluorescence. A shielding device is used to change the ambient conditions additionally to the feeding gas composition. Varying the amount of N2 and air admixed to the feeding gas as well as changing the shielding gas from N2 to air reveals that the highest N2(A3Σ+u) is achieved in the case of air admixtures in spite of the enhanced collisional quenching due to the presence of O2. The reasons for these observations are discussed in detail.
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