Quantitative Evaluation of the Densities of Ar-N2 and N2 Flowing Afterglows at Atmospheric Gas Pressure | Chapter 19 | Plasmas Afterglows with N2 for Surface Treatments synthesis 2024

Recombination of N- atoms in N₂ flowing afterglows is well characterized by optical emission of the N₂, positive yellow band at 580 nm which is considered as a signature of N-atoms in the afterglow at reduced and high gas pressures. Production of 𝑁₂(𝐵,𝑣′) states are analyzed from the 𝑁₂, positive band intensity in Ar- 𝑁₂ and 𝑁₂ afterglows of microwave plasmas and in N2 Corona discharges. In Ar- N₂ afterglows of microwave discharges, the N₂( B,v′) distribution depends on the N₂ fraction in Ar. In pure 𝑁2 afterglows, it is found that the 𝑁₂(𝐵,𝑣′ = 11) state is enhanced by the 𝑁 +𝑁 atom recombination at pressure up to the atmospheric gas pressure. The other N₂( B,v′ > 0) states are also produced in N₂ and Ar − N₂ Corona and microwave afterglows by the 𝑁+𝑁 atom recombination, via the 𝑁₂(𝐴3Σ+𝑢,𝑤3Δ𝑢) attractive curves. It appears that the relaxation of vibrational levels of 𝑁₂(𝐴) and 𝑁2(𝑤) states at the benefit of the 𝑁₂(𝐵,𝑣′ = 0) state is enhanced in Corona as in Dielectric Barrier Discharge (DBD) afterglows.

 

Author (s) Details

André Ricard
LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.

 

Freddy Gaboriau
LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.

 

Anne-Marie Pointu
LPGP, Université de Paris-Saclay, 91405 Orsay, France.

 

Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-93-5/CH19