On the quenching of excited electronic states of molecular nitrogen in nanosecond pulsed discharges in atmospheric pressure air

Bak, Moon Soo; Kim, W.; Cappelli, Mark A.

doi:10.1063/1.3535986

Cited by 39 publications

(19 citation statements)

References 19 publications

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“…Simulated spectra are fitted to the measurements to determine the gas temperature, by assuming that the rotational distribution is in thermal equilibrium with the neutral-gas temperature [42,43] as previously undertaken in high-pressure discharges for applications including, e.g. combustion [44], electric propulsion [45] and biomedicine [46][47][48]. Our spectrum simulation is based on molecular constants from [49] and line strength expressions from [50] for intermediate coupling of upper and lower state between Hund's case (a) and (b).…”

Section: Methodsmentioning

confidence: 99%

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

Dedrick

Schröter

Niemi

et al. 2017

J. Phys. D: Appl. Phys.

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Radio-frequency driven atmospheric pressure plasmas are efficient sources for the production of reactive species at ambient pressure and close to room temperature. Pulsing the radio-frequency power input provides additional control over species production and gas temperature. Here, we demonstrate the controlled production of highly reactive atomic oxygen and nitrogen in a pulsed radio-frequency ( MHz) atmospheric-pressure plasma, operated with a small % air-like admixture (/ at ) through variations in the duty cycle. Absolute densities of atomic oxygen and nitrogen are determined through vacuum-ultraviolet absorption spectroscopy using the DESIRS beamline at the SOLEIL synchrotron coupled with a high resolution Fourier-transform spectrometer. The neutral-gas temperature is measured using nitrogen molecular optical emission spectroscopy. For a fixed applied-voltage amplitude (234 V), varying the pulse duty cycle from 10% to 100% at a fixed 10 kHz pulse frequency enables us to regulate the densities of atomic oxygen and nitrogen over the ranges of – and – , respectively. The corresponding 11 K increase in the neutral-gas temperature with increased duty cycle, up to a maximum of K, is relatively small. This additional degree of control, achieved through regulation of the pulse duty cycle and time-averaged power, could be of particular interest for prospective biomedical applications.

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Section: Methodsmentioning

confidence: 99%

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

Dedrick

Schröter

Niemi

et al. 2017

J. Phys. D: Appl. Phys.

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“…OH and CH PLIF experiments were performed to confirm the large OH and CH streamer-induced production over the discharge volume. Papers [Bak et al, 2011;Stancu et al, 2010] discuss an important question on the channels of molecular oxygen dissociation in pulsed discharges. In [Bak et al, 2011] time-resolved emission measurements for N 2 (C-B) and N 2 (B-A) transitions were carried out in nanosecond pulsed discharges in air and pure nitrogen.…”

Section: Kinetics Of Plasma Assisted Combustion Below Self-ignition Tmentioning

confidence: 99%

“…Papers [Bak et al, 2011;Stancu et al, 2010] discuss an important question on the channels of molecular oxygen dissociation in pulsed discharges. In [Bak et al, 2011] time-resolved emission measurements for N 2 (C-B) and N 2 (B-A) transitions were carried out in nanosecond pulsed discharges in air and pure nitrogen. 0-D kinetic simulations coupled with energy equation are conducted to predict quenching rate coefficients of quenching of N 2 * by N 2 and dissociative quenching of N 2 * by O 2 by matching the simulated emission curves to the corresponding measurements.…”

Section: Kinetics Of Plasma Assisted Combustion Below Self-ignition Tmentioning

confidence: 99%

“…That is why some authors prefer to use controlled inhomogeneous excitation instead. For example, in papers [Bak et al, 2011;Stancu et al, 2010;Grisch et al, 2009;Wu et al, , 2011 the point-to-point electrodes geometry was used. This geometry generates non-uniform streamer-like discharge but because of its high reproducibility allows to reconstruct the spatial distribution of excitation and kinetics in plasma.…”

Section: Kinetics Of Plasma Assisted Combustion Below Self-ignition Tmentioning

confidence: 99%

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Plasma-Assisted Ignition and Combustion

Starikovskiy¹,

Aleksandrov²

2011

Aeronautics and Astronautics

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“…Studies have shown that these discharges are effective in shortening ignition delay times [5,6] and in flame holding [7][8][9]. This enhanced flame stability has been attributed to the production of radicals such as atomic oxygen (O) in significant amounts within the plasma [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Numerical studies of nitric oxide formation in nanosecond-pulsed discharge-stabilized flames of premixed methane/air

Bak

Cappelli

2015

Phil. Trans. R. Soc. A.

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One contribution of 14 to a theme issue 'Physics and chemistry of plasma-assisted combustion' . A simulation is developed to investigate the kinetics of nitric oxide (NO) formation in premixed methane/air combustion stabilized by nanosecondpulsed discharges. The simulation consists of two connected parts. The first part calculates the kinetics within the discharge while considering both plasma/combustion reactions and species diffusion, advection and thermal conduction to the surrounding flow. The second part calculates the kinetics of the overall flow after mixing the discharge flow with the surrounding flow to account for the effect that the discharge has on the overall kinetics. The simulation reveals that the discharge produces a significant amount of atomic oxygen (O) as a result of the high discharge temperature and dissociative quenching of excited state nitrogen by molecular oxygen. This atomic oxygen subsequently produces hydroxyl (OH) radicals. The fractions of these O and OH then undergo Zel'dovich reactions and are found to contribute to as much as 73% of the total NO that is produced. The post-discharge simulation shows that the NO survives within the flow once produced.

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On the quenching of excited electronic states of molecular nitrogen in nanosecond pulsed discharges in atmospheric pressure air

Cited by 39 publications

References 19 publications

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

Plasma-Assisted Ignition and Combustion

Numerical studies of nitric oxide formation in nanosecond-pulsed discharge-stabilized flames of premixed methane/air

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