Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Abstract

A numerical 0D kinetic model is developed here to simulate the detailed kinetics of the ground and excited electronic states of atmospheric gases occurring under streamer discharge conditions. The model is based on an extended kinetic scheme that involves state-to-state vibrational kinetics of the ground electronic states of N2, O2 and NO diatomics, including e–V, V–V and V–T energy transfers, and contains about 104 processes for more than 500 tracked state-specific states (including the higher excited and autoionising states of NI/OI atomic species), and also for state-non-specific species. This scheme takes into account the most important radiative processes occurring in N2 and N2–O2 mixtures that are of diagnostic interest, including the extreme ultraviolet and vacuum ultraviolet radiation produced by many excited and autoionising states of NI/OI. The dependence of the rates of electron-impact processes on the reduced electric field E/N is found by solving the Boltzmann equation for electrons in the two-term approximation using the Boltzmann equation solver Open Source library, BOLOS. We examine several test cases: pure nitrogen at 50 and 200 Torr and synthetic air at 10, 50 and 760 Torr, at a gas temperature of 300 K. The numerical results for pure nitrogen were compared with experimental results recently obtained by laser induced fluorescence for metastables. Good qualitative agreement was observed between numerical simulations and experiments at vibronic levels v = 2–5, giving important feedback on the appropriateness of the kinetic scheme. Numerical results were also used to find several general spectrometric signatures that might be helpful in the development of diagnostic procedures.

Mode transition and plasma characteristics of nanosecond pulse gas–liquid discharge: Effect of grounding configuration

“…In the nitrogen discharge, the electron‐impact dissociation of N 2 will produce ground state N ( 2 D), N ( 2 P), and N ( 4 S), and then produce the excited state N (3 p ) via the electron‐impact excitation processes . The related reactions are shown as R1–R3 in Table .…”

“…Both of the OES in the two grounding configurations consist of OH (A 2 Σ → X 2 Π), the second positive system of molecular nitrogen (C 3 Π u → B 3 Π g , ʋ′, ʋ″), the first negative system of molecular nitrogen ion ( → B Σ X Σ In the nitrogen discharge, the electron-impact dissociation of N 2 will produce ground state N ( 2 D), N ( 2 P), and N ( 4 S), and then produce the excited state N (3p) via the electron-impact excitation processes. [22,23] The related reactions are shown as R1-R3 in Table 1. Ground state H atoms are generated through the electron dissociation of H 2 O, and excited to H (n = 3) by electron excitation processes (see R4 and R5).…”

Spatial‐temporal evolutions of surface discharge patterns generated on dielectric target interacted with a plasma jet

“…Then, nitrogen metastables, such as and can be created through vertical quenching of triplet states as follows: …”

Plasma-assisted agriculture: history, presence, and prospects—a review

“…Processes occurring in low-temperature nonequilibrium plasmas are determined by extremely complex kinetics [177][178][179] occurring in nitrogen-oxygen mixtures under atmospheric pressure. The importance and impact of these species depend on their kinetic energy, reactivity, and diffusion as well as their extent of interaction with solid materials.…”

“…In principle, air (nitrogen-oxygen) plasmas represent a source of UV-Vis NIR radiation produced by molecular (mainly N 2 or NO) and atomic (mainly N I and O I ) species [178,225,226]. Furthermore, under humid conditions (e.g.…”