Incomplete ozone recovery effect in the presence of active oxygen species

Pershin, A. A.; Torbin, A. P.; Azyazov, Valeriy N.

doi:10.3103/s1068335616010061

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…The reverse situation is observed with increasing the N2O pressure which indicates the course of reactions between O3(υ) and nitrous oxides. Accurate measurements of the rate constants for processes (4) and (5) require further investigation.…”

Section: Discussionmentioning

confidence: 99%

“…We can see that the ozone concentration does not reach initial values 0 O3 N and tend at t → ∞ to certain values of inf O3 N . This phenomenon was called the incomplete ozone recovery effect [5]. An addition of components quenching vibrationally excited ozone to the mixture increases the degree of ozone recovery, determined from the expression…”

Section: Experimental Approachmentioning

confidence: 99%

“…(4) has more probability then reaction with thermalized ozone with the rate constant 1.8×10 -14 cm 3 /s [6]. Reaction (4) competes with the relaxation process MATEC Web of Conferences 209, 00016 (2018) https://doi.org/10.1051/matecconf/201820900016 ComPhysChem'18 O3(υ) + N2О  О3 + N2О (5) for which there is no any kinetic information. The experimental results in Fig.…”

Section: Ozone Recovery In the Presence Of Nitrious Oxidesmentioning

confidence: 99%

“…4 show that addition of N2O into the gas mixture significantly decreases the degree of ozone recovery. Unfortunately the method used in this study does not allow to separate processes (4) and (5) because NO is actively produced due to reactions of N2O with photolysis products. Thus we used kinetic modeling to estimate the orders of magnitude of the rate constants for the processes (4) and (5) which amounted to ~10 -11 cm 3 /s and ~10 -13 cm 3 /s, respectively.…”

Section: Ozone Recovery In the Presence Of Nitrious Oxidesmentioning

confidence: 99%

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Ozone recovery in the presence of CO and N₂O

et al. 2018

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Extremely reactive vibrationally excited ozone O3(υ) molecule is formed in excess of O2 in particular in air-fuel mixture, however there is a lack of kinetic data on O3(υ) reactions with combustion products. The time-resolved absorption spectroscopy method was applied for measurements of the O3 recovery rates after 266 nm photolysis in the presence of O, CO and nitrous oxides. It was revealed that reaction O3(υ) + O results in an incomplete ozone recovery. In the reaction O3(υ) + O stabilization channel dominates the reactionary one. In the presence of N2O, ozone does not restore to its initial level.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Approachmentioning

confidence: 99%

Section: Ozone Recovery In the Presence Of Nitrious Oxidesmentioning

confidence: 99%

Section: Ozone Recovery In the Presence Of Nitrious Oxidesmentioning

confidence: 99%

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Ozone recovery in the presence of CO and N₂O

et al. 2018

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Ozone destruction due to the recombination of oxygen atoms

Pershin

Torbin

Mikheyev

et al. 2021

The Journal of Chemical Physics

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Kinetics of ozone destruction due to the recombination of oxygen atoms produced by pulsed 266 nm laser photolysis of O3/M (M = CO2 and/or N2) mixtures was studied using the absorption and emission spectroscopy to follow time evolutions of O3 and electronically excited molecules O2* formed in the recombination process 2O(3P) + M → O2* + M. An unexpected high ozone destruction rate was observed when O2* was present in the system. The kinetic model developed for the oxygen nightglow on the terrestrial planets was adapted to interpret the detected temporal profiles of the ozone number density and the O2* emission intensities. It was deduced that the vibrationally excited singlet delta oxygen molecule O2(a1Δ, υ) formed in the secondary processes reacts efficiently with ozone in the process O2(a1Δ, υ ≥ 3) + O3 → 2O2 + O, and the rate constant of this process was estimated to be 3 × 10−11 cm3 s−1. Ab initio calculations at the CASPT2(14, 12)/cc-pVTZ/UωB97XD/cc-pVTZ level of theory were applied to find the reaction pathway from the reactants to products on the O5 potential energy surface. These calculations revealed that the O2(a1Δ) + O3 reaction is likely to proceed via singlet–triplet intersystem crossing exhibiting an energy barrier of 9.6 kcal/mol, which lies between two and three quanta of vibrational excitation of O2(a1Δ), and hence, O2(a1Δ, υ) with υ ≥ 3 could rapidly react with ozone.

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Kinetics of highly vibrationally excited O₂(X) molecules in inductively-coupled oxygen plasmas

Annusova¹,

Marinov²,

Booth³

et al. 2018

Plasma Sources Sci. Technol.

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The high degree of vibrational excitation of O 2 ground state molecules recently observed in inductively coupled plasma discharges is investigated experimentally in more detail and interpreted using a detailed self-consistent 0D global kinetic model for oxygen plasmas. Additional experimental results are presented and used to validate the model. The vibrational kinetics considers vibrational levels up to v=41 and accounts for electron impact excitation and de-excitation (e-V), vibration-to-translation relaxation (V-T) in collisions with O 2 molecules and O atoms, vibration-to-vibration energy exchanges (V-V), excitation of electronically excited states, dissociative electron attachment, and electron impact dissociation. Measurements were performed at pressures of 10-80 mTorr (1.33 and 10.67 Pa) and radio frequency (13.56 MHz) powers up to 500 W. The simulation results are compared with the absolute densities in each O 2 vibrational level obtained by high sensitivity absorption spectroscopy measurements of the Schumann-Runge bands for O 2 (X, v=4-18), O( 3 P) atom density measurements by two-photon absorption laser induced fluorescence (TALIF) calibrated against Xe, and laser photodetachment measurements of the O − negative ions. The highly excited O 2 (X, v) distribution exhibits a shape similar to a Treanor-Gordiets distribution, but its origin lies in electron impact e-V collisions and not in V-V up-pumping, in contrast to what happens in all other molecular gases known to date. The relaxation of vibrational quanta is mainly due to V-T energy-transfer collisions with O atoms and to electron impact dissociation of vibrationally excited molecules, e+O 2 (X, v)→O( 3 P)+O( 3 P).

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Incomplete ozone recovery effect in the presence of active oxygen species

Cited by 4 publications

References 14 publications

Ozone recovery in the presence of CO and N₂O

Ozone recovery in the presence of CO and N₂O

Ozone destruction due to the recombination of oxygen atoms

Kinetics of highly vibrationally excited O₂(X) molecules in inductively-coupled oxygen plasmas

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Incomplete ozone recovery effect in the presence of active oxygen species

Cited by 4 publications

References 14 publications

Ozone recovery in the presence of CO and N2O

Ozone recovery in the presence of CO and N2O

Ozone destruction due to the recombination of oxygen atoms

Kinetics of highly vibrationally excited O2(X) molecules in inductively-coupled oxygen plasmas

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Product

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Ozone recovery in the presence of CO and N₂O

Ozone recovery in the presence of CO and N₂O

Kinetics of highly vibrationally excited O₂(X) molecules in inductively-coupled oxygen plasmas