Singlet oxygen in the low-temperature plasma of an electron-beam-sustained discharge

Vagin, N. P.; Ионин, А. А.; Klimachev, Yu. M.; Kotkov, A. A.; Кочетов, И. В.; Napartovich, A. P.; Podmar’kov, Yu P; Rulev, O. A.; Селезнев, Л. В.; Sinitsyn, D. V.; Фролов, М П; Yuryshev, Nikolai N

doi:10.1134/s1063780x06050096

Cited by 5 publications

(12 citation statements)

References 10 publications

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“…Main attention is paid to the decay of SDO luminescence pulse caused by SDO quenching and diminishing of the SDO concentration in the gas mixture. The gas pressure decrease results in the elongation of the SDO luminescence pulse (compare curves 1 in figures 11 and 12) observed earlier in paper [13]. However, much more influence on the SDO luminescence is rendered by the addition of nitric oxide into the oxygen gas mixture.…”

Section: Time Behaviour Of the Sdo Concentrationsupporting

confidence: 57%

“…In the previous experiments [12,13], when detecting SDO radiation at the wavelength 1.27 µm in the course of the EBSD pulse and just after it, strong luminescence not connected with SDO luminescence was observed. In the experiments described in this paper a similar luminescence, perhaps related to the NO 2 luminescence, was observed within the detected wavelength interval 1.24-1.30 µm.…”

Section: Time Behaviour Of the Sdo Concentrationmentioning

confidence: 87%

“…Excitation of the oxygen containing gas mixture in the steady regime was carried out by a pulsed e-beam sustained discharge (EBSD) by applying the EBSD facility described in [11][12][13].…”

Section: Experimental Facilitymentioning

confidence: 99%

“…A schematic of the experimental setup is presented in figure 1. A diffraction monochromator with spectral resolution ∼10 nm was used for spectral selection of the SDO luminescence [12,13].…”

Section: Experimental Facilitymentioning

confidence: 99%

“…It allowed us to conclude that the observed at 1.27 µm long luminescence is caused by SDO. One can find details of the spectral measurements of SDO luminescence in pulsed EBSD discharge in [13]. Thus, when presenting the time behaviour of SDO luminescence below, its intensity at the beginning of SDO luminescence pulse is not considered.…”

Section: Time Behaviour Of the Sdo Concentrationmentioning

confidence: 99%

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Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Ионин¹,

Klimachev²,

Kozlov³

et al. 2008

J. Phys. D: Appl. Phys.

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The influence of nitrogen oxides NO and NO2 on the specific input energy (SIE) and the time behaviour of singlet delta oxygen (SDO) luminescence excited by a pulsed e-beam sustained discharge in oxygen were experimentally and theoretically studied. NO and NO2 addition into oxygen results in a small increase and decrease in the SIE, respectively, the latter being connected with a large energy of electron affinity to NO2. The addition of 0.1–0.3% nitrogen oxides was experimentally and theoretically demonstrated to result in a notable enhancement of the SDO lifetime, which is related to a decrease in the atomic oxygen concentration in afterglow. It was experimentally demonstrated that to get a high SDO concentration at the gas pressure 30–60 Torr for a time interval of less than ∼0.5 s one needs to add not less than 0.2% nitrogen oxides into oxygen. The temperature dependence of the relaxation constant for SDO quenching by unexcited oxygen was estimated by using experimental data on the time behaviour of SDO luminescence.

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Section: Time Behaviour Of the Sdo Concentrationsupporting

confidence: 57%

Section: Time Behaviour Of the Sdo Concentrationmentioning

confidence: 87%

“…Excitation of the oxygen containing gas mixture in the steady regime was carried out by a pulsed e-beam sustained discharge (EBSD) by applying the EBSD facility described in [11][12][13].…”

Section: Experimental Facilitymentioning

confidence: 99%

Section: Experimental Facilitymentioning

confidence: 99%

Section: Time Behaviour Of the Sdo Concentrationmentioning

confidence: 99%

See 3 more Smart Citations

Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Ионин¹,

Klimachev²,

Kozlov³

et al. 2008

J. Phys. D: Appl. Phys.

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Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

260

190

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An overview is presented of experimental and theoretical research in the field of physics and engineering of singlet delta oxygen (SDO) production in low-temperature plasma of various electric discharges. Attention is paid mainly to the SDO production with SDO yield adequate for the development of an electric discharge oxygen–iodine laser (DOIL). The review comprises a historical sketch describing the main experimental results on SDO physics in low-temperature plasma obtained since the first detection of SDO in electric discharge in the 1950s and the first attempt to launch a DOIL in the 1970s up to the mid-1980s when several research groups started their activity aimed at DOIL development, stimulated by success in the development of a chemical oxygen–iodine laser (COIL). A detailed analysis of theoretical and experimental research on SDO production in electric discharge from the mid-1980s to the present, when the first DOIL has been launched, is given. Different kinetic models of oxygen low-temperature plasma are compared with the model developed by the authors. The latter comprises electron kinetics based on the accompanying solution of the electron Boltzmann equation, plasma chemistry including reactions of excited molecules and numerous ion–molecular reactions, thermal energy balance and electric circuit equation. The experimental part of the overview is focused on the experimental methods of SDO detection including experiments on the measurements of the Einstein coefficient for SDO transition and experimental procedures of SDO production in self-sustained and non-self-sustained discharges and analysis of different plasma-chemical processes occurring in oxygen low-temperature plasma which brings limitation to the maximum SDO yield and to the lifetime of the SDO in an electric discharge and its afterglow. Quite recently obtained results on gain and output characteristics of DOIL and some projects aimed at the development of high-power DOIL are discussed.

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Quantitative measurements of singlet molecular oxygen in a low pressure ICP

Rogers

Bond

Peverall

et al. 2021

Plasma Sources Sci. Technol.

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We present measurements of the densities and temperatures (rotational and translational) of the metastable a 1 Δ g (v = 0) state of O 2 in a cylindrically symmetric RF driven plasma operating in inductive mode at 100 mTorr total pressure and 300 W applied power. Line-of-sight absorption across the plasma region was determined by diode laser cavity ringdown spectroscopy on the (0, 0) vibrational band of the O 2 (b 1 Σ g + ) ← O 2 (a 1 Δ g ) transition near 1.9 μm. Four rotational quantum states were studied, with a population distribution corresponding to a rotational temperature of 346 ± 38 K. The translational temperature was determined to be 359 ± 16 K from the width of the strongest absorption line, Q(12), and in equilibrium with the rotational distribution. The absolute concentration of O 2 (a 1 Δ g , v = 0) was measured as (9.5 ± 1.3) × 10 13 cm −3 , and corresponds to an apparent (3.5 ± 0.45)% contribution to the total number density. Time-resolved CRDS measurements following plasma extinction were used to deduce a wall loss coefficient, γ, of (2.8 ± 0.3) × 10 −3 on predominantly Al surfaces. Surmising reasonable concentrations for O 2 (b 1 Σ g + ) and an upper limit for the vibrational temperature places the total contribution of O 2 (a 1 Δ g ) at between 3.6% and 5.85%. The variation of the O 2 (a 1 Δ g , v = 0) state concentration with RF power shows a clear transition from the E to H mode excitation near an applied power of 150 W. Allan variance analysis yields a minimum measurable concentration of O 2 (a 1 Δ g , v = 0) of 1.1 × 10 12 cm −3 over 100 ringdown events, an order of magnitude more sensitive than previously reported.

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Singlet oxygen in the low-temperature plasma of an electron-beam-sustained discharge

Cited by 5 publications

References 10 publications

Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Quantitative measurements of singlet molecular oxygen in a low pressure ICP

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Singlet oxygen in the low-temperature plasma of an electron-beam-sustained discharge

Cited by 5 publications

References 10 publications

Influence of nitrogen oxides NO and NO2on singlet delta oxygen production in pulsed discharge

Influence of nitrogen oxides NO and NO2on singlet delta oxygen production in pulsed discharge

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Quantitative measurements of singlet molecular oxygen in a low pressure ICP

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Product

Resources

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Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge