Active nitrogen atoms in an atmospheric pressure flowing Ar-N₂microwave discharge

Abstract

The flowing afterglow of an Ar-N2 mixed gas plasma gives rise to the recombination of nitrogen atoms according to the reaction N(4S)+N(4S)+(Ar-N2)KB(V') to N2(B3 pi g,v')+(Ar-N2) N2(B3 pi g,v') to N2(A3 Sigma uv")+hv (first positive system). Quantitative optical spectroscopy measurements of the emission spectra of the N2(B3 pi g-A3 Sigma u) transition have allowed determination of the total KB and individual KB(v') rates of atomic nitrogen recombination into excited N2 molecules in the B3 pi g state with upper vibrational levels v' between 1 and 12. The active nitrogen atoms are produced by dissociation of N2 molecules in a surface-wave-induced microwave discharge (2450 MHz) sustained in an open-ended dielectric tube. The discharge is operated at atmospheric pressure and the absorbed microwave power is about 200 W for a 5 cm discharge length.

Temperature Dependence of the Rate of the Reaction N + H + Ar → NH + Ar

“…The details of the experimental set-up have been described in previous papers [4] [5]. Atomic nitrogen and hydrogen are produced in a flowing Ar -N2 -H, gas discharge at atmospheric pressure by an electrode-less discharge (2450 MHz) in a silica tube of 3 mm inner diameter.…”

“…From reactions (I), (2), (3), (4), and (5) we derive: Due to the small concentration of (H,) compared to that of (N,) the reaction (5) was assumed negligible relatively to reaction (4). Moreover the (NH) concentration is small so that the reaction:…”

Spectral intensity of the N2emission in argon low-pressure arc discharges for lighting purposes

“…In a first approach, this model was chosen to be neither rotationally nor vibrationally resolved, as only the integral emission and the separation into UV and VIS radiation was of interest together with the coupling to the electronic states of the argon atom. The spectral ro-vibrationally distribution, however, is of minor interest for this study, whereas it has been extensively studied, for example, in [27,32,39,40,[42][43][44][45][46][47][48][49][50][51]. Therefore the emission from both the nitrogen systems is to be seen as an integral over all vibrational bands (in simulation as well as experimentally).…”

Kinetic Study of the Emission of the First Negative System in an Argon‐Nitrogen Plasma at Atmospheric Pressure

“…Recognizing the need for temperature dependence of rate constant information for plasma chemical applications we have recently reported [4] an experimental study on the gas temperature dependence for the total K B and the individual KB(u') three-body coefficients of atomic nitrogen recombination into excited N, molecules in the B 317s state with upper vibrational level u' between 1 and 12.…”