Kinetics of atoms, metastable, radiative and ionic species in the nitrogen pink afterglow

Abstract

Direct current N 2 flowing discharges were generated and conditions for the pink afterglow were obtained. Emissions from N 2 (B, C) and N + 2 (B) radiative states were studied as a function of pressure, flow rate and post-discharge position. A one-dimensional kinetic model accounting for N 2 (X, v), N 2 (A, B, C, a, a , a ), N( 4 S), N + 1−4 (X) and N + 2 (B) species has been developed in order to describe the experimental observations. The analysis on the complete set of processes assumed in this paper has provided possible generation mechanisms for N atoms, N + 2 (B) ions and N 2 (B, C) electronically excited states as well as for metastable ones. It has been shown that ionization, excitation and dissociation processes occur simultaneously at the post-discharge region when the vibrational distribution function of N 2 (X, v) states heats as resulting from the efficient V-V pumping mechanism, which is very sensitive to pressure conditions. Here, the pink afterglow is described as a non-equilibrium plasma, i.e. ambipolar diffusion for ions and the condition of charge neutrality are assumed.

Detection of metastable excited molecules N2(A3Σu+) in an atmospheric pressure nitrogen discharge by Raman scattering

“…Determination of the concentration of N 2 (A 3 Σ u + ) by combining emission spectroscopy measurements with modeling of the generation and decay of excited molecules, atoms, and ions has also been reported [16,17]. Modeling based on pure calculations without using optical emission data has also been performed [18][19][20], but these focus on the low-pressure regions commonly used in plasma processes.…”

Nitrogen dissociation degree in the diffusion region of a helicon plasma source obtained by atomic lines to molecular band intensities ratio

“…As proposed by Levanton et al, 46 as a zero order approximation, we used our experimentally measured relative vibrational distribution of the B 3 ⌸ g state and the available X → B Frank-Condon factors 10 to determine the relative vibrational distribution of the X state. As proposed by Levanton et al, 46 as a zero order approximation, we used our experimentally measured relative vibrational distribution of the B 3 ⌸ g state and the available X → B Frank-Condon factors 10 to determine the relative vibrational distribution of the X state.…”

A comparison of plasma-activated N2∕O2 and N2O∕O2 mixtures for use in ZnO:N synthesis by chemical vapor deposition

“…The presence of the N peak at 398 eV is indicative of the successful incorporation of N into the ZnO lattice, as this peak is often ascribed to Zn-N bonding. The m / z = 30 signal ͑ 14 N 16 O͒ was used to monitor N, as is common practice for ZnO:N. 15,44 The contributions of minor signals, such as 30 Si and 30 CO, were accounted for using the intensity measured in the intrinsic films. The Zn-N bonding state shown in Fig.…”