Vibrational distributions of CO molecules in a dc discharge in the presence of molecular oxygen admixture

Grigor'yan, G. M.; Кочетов, И. В.; Kurnosov, A K

doi:10.1088/0022-3727/43/8/085201

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…No significant difference in the vibrational kinetics is expected for vibrational levels below v = 10 between the assumption of single and multiquanta relaxation. However, for higher vibrational levels, the best agreement of modelled and experimental CO VDFs was achieved for the 'multi-quanta' mechanism (loss of all vibrational quanta upon collision) [67].…”

Section: Vibrational Quenching On the Wallmentioning

confidence: 98%

Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions

Fromentin

Silva

Dias

et al. 2023

Plasma Sources Sci. Technol.

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This work explores the effect of O2 addition on CO2 dissociation and on the vibrational kinetics of CO2 and CO under various non-equilibrium plasma conditions. A self-consistent model, previously validated for pure CO2 discharges, is further extended by adding the vibrational kinetics of CO, including electron impact excitation and de-excitation (e-V), vibration-to-translation relaxation (V-T) and vibration-to-vibration energy exchange (V-V) processes. The vibrational kinetics considered include levels up to v = 10 for CO and up to v1 = 2 and v2 = v3 = 5, respectively for the symmetric stretch, bending and asymmetric stretch modes of CO2, and accounts for e-V, V-T in collisions between CO, CO2 and O2 molecules and O atoms and V-V processes involving all possible transfers involving CO2 and CO molecules. The kinetic scheme is validated by comparing the model predictions with recent experimental data measured in a DC glow discharge, operating at pressures in the range 0.4 - 5 Torr (53.33 - 666.66 Pa). The experimental results show a lower vibrational temperature of the different modes of CO2 and a decreased dissociation fraction of CO2 when O2 is added to the plasma but an increase of the vibrational temperature of CO. On the one hand, the simulations suggest that the former effect is the result of the stronger V-T energy-transfer collisions with O atoms which leads to an increase of the relaxation of the CO2 vibrational modes; On the other hand, two main mechanisms contribute to the lower CO2 dissociation fraction with increased O2 content in the mixture: the back reaction, CO(a3Πr) + O2 → CO2 + O and the recombinative detachment O- + CO → e + CO2.

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Section: Vibrational Quenching On the Wallmentioning

confidence: 98%

Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions

Fromentin

Silva

Dias

et al. 2023

Plasma Sources Sci. Technol.

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“…[18], where they have been validated by comparing kinetic modeling predictions with spatially resolved measurements of vibrational level populations of CO, N 2 , and O 2 in optical pumping experiments [13,18]. The rates have been modified taking into account measurements and semiclassical trajectory calculations of V-V rates for CO-CO [19,20] [30,31], and N 2 -O 2 [32]. Although more recent calculations of N 2 -O 2 V-V rates [33], using a more accurate potential energy surface [34], are available, at the present conditions the effect of V-Vexchange between N 2 and O 2 on predicted CO vibrational level populations and laser power is very weak because high vibrational level populations of nitrogen and oxygen are extremely low (see Sec.…”

Section: Kinetic Modelmentioning

confidence: 99%

Electrically Excited, Supersonic Flow Carbon-Monoxide Laser with Air Species in Laser Mixture

Yurkovich

Eckert

Jans

et al. 2018

Journal of Propulsion and Power

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Performance parameters of an electric discharge excited, supersonic flow CO laser operated with significant amounts of air species in the laser mixture is studied experimentally and by kinetic modeling. The results demonstrate that adding nitrogen to the CO-He mixture increases the laser power significantly, by up to a factor of 3. Adding oxygen reduces CO vibrational excitation and results in a steep laser power reduction. Adding air to the laser mixture also produces higher output power, such that the positive effect of nitrogen outweighs the negative effect of oxygen. This result indicates that a chemical CO laser, not dependent on the electric discharge for excitation, may be capable of operating in a mixture of carbon vapor and air. Performance of a supersonic flow chemical laser excited by a reaction of carbon vapor and molecular oxygen is analyzed by kinetic modeling. Peak laser power is predicted at the C vapor mole fraction of 0.2%, when 15% of energy stored in CO vibrational energy mode (4.5% of the reaction enthalpy) is converted to laser power. At higher C vapor mole fractions, flow temperature rise caused by exothermic reactions and by CO vibrational relaxation results in rapid reduction of the predicted laser power.

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“…The same cross sections for electron scattering with atoms, molecules and vibrationally excited CO molecules were used as in ref. 12. And so, the cross-sections for electron scattering with ground state CO molecules and He atoms were applied the same as in ref.…”

Section: Theoretical Modelmentioning

confidence: 99%

Heterogeneous vibrational relaxation of carbon monoxide

Grigorian

Cenian

2013

Phys. Chem. Chem. Phys.

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The first results relating to heterogeneous vibrational relaxation of carbon monoxide in an Al2O3 ceramics tube are reported, together with an estimation of its probability. It was found that the probability of heterogeneous relaxation εv of the first-excited state of CO on the Al2O3 surface lies in the range (5 to 7) × 10(-2). The measurements show that the probabilities of heterogeneous relaxation of CO(X(1)Σ, v) do not depend on the value of v, at least for v = 1, 2 and 3.

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Vibrational distributions of CO molecules in a dc discharge in the presence of molecular oxygen admixture

Cited by 7 publications

References 25 publications

Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions

Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions

Electrically Excited, Supersonic Flow Carbon-Monoxide Laser with Air Species in Laser Mixture

Heterogeneous vibrational relaxation of carbon monoxide

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Vibrational distributions of CO molecules in a dc discharge in the presence of molecular oxygen admixture

Cited by 7 publications

References 25 publications

Study of vibrational kinetics of CO2 and CO in CO2–O2 plasmas under non-equilibrium conditions

Study of vibrational kinetics of CO2 and CO in CO2–O2 plasmas under non-equilibrium conditions

Electrically Excited, Supersonic Flow Carbon-Monoxide Laser with Air Species in Laser Mixture

Heterogeneous vibrational relaxation of carbon monoxide

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Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions

Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions