Spectroscopic characterization of atmospheric pressure argon plasmas sustained with the Torche à Injection Axiale sur Guide d'Ondes

Time resolved optical emission spectroscopy in power modulated atmospheric pressure plasma jet

“…2) were recorded with sufficient intensity and resolution, one may use [26] either the first negative system at 391.4 nm or second positive system bands at 337.4 or 380.4 nm. In this paper, it was chosen (Table 4) [41].…”

Influence of Ambient-Air Nitrogen on the Argon Plasma Generated by a TIAGO Torch Open to Atmosphere

“…W HEN plasma is generated in contact with the open air, nitrogen strongly affects plasma kinetics [1]- [3]. Since this interaction can be detrimental for certain application purposes due to the reduction of the electron density, gaining knowledge concerning the experimental conditions under which the impact of nitrogen on the discharge kinetics can be avoided or diminished is a key concern.…”

“…The experimental setup used in this paper has been previously described in [3]. Different Ar flows and input powers were used.…”

“…However, in plasmas operated at the open air, excited nitrogen molecules and molecular ions are formed by means of charge transfer (3) and Penning excitation reactions (4) between Ar ions (15.8 eV) and metastable atoms (11.5 eV) with nitrogen ground state molecules due to an almost resonant energy of the corresponding particles followed by dissociative recombination of nitrogen molecules ions (5): In this way, ionization via electron excitation or charge transfer reaction (3) followed by (5) could lead to the formation of other molecular species (CN, NH, or NO) detected in the radiation spectra [3] formed by three body recombination.…”

“…When process (5) is favored [8] the ionization route is noticeably perturbed and electron density decreases [3]. This can be an important factor in plasma applications relying on the electron population to produce energy exchanges with analytes or products introduced in the discharge.…”