https://doi.org/10.1140/epjd/s10053-022-00512-5
Regular Article – Plasma Physics
Formation of N2(B, v′) levels in N2, N2/Ar and N2/He reduced pressure late afterglows
LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062, Toulouse, France
e
sarrette@laplace.univ-tlse.fr
Received:
5
July
2022
Accepted:
19
September
2022
Published online:
13
October
2022
The emission spectrum of nitrogen and of mixtures of nitrogen with noble gases (Ar, He) was studied and relative vibrational intensities of the nitrogen first positive (N2 1+) system (N2(B, v′) → N2(A, v′′) + hν) recorded between 570 and 1040 nm in the afterglow of a flowing microwave discharge at 8 Torr. In this region, N2(B, v′) relative populations were deduced from the recorded spectra and absolute N-atom concentrations measured by NO titration. Absolute N-atom densities were also obtained by TALIF, showing a good agreement between the two diagnostic methods. From this data, rate coefficients for the N-atom recombination in specific N2(B, v′) vibronic levels were obtained in N2 and in mixtures of N2 with Ar or He. Additionally, concentrations of N2(A), N2(X, v = 12–13) molecules and of N2+ ions were also deduced from band intensity ratios in the transition region between the pink and the late afterglows.
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