O2(a1Δ) quenching in the O/O2/O3 system

Azyazov, Valeriy N.; Mikheyev, P. A.; Postell, David; Heaven, Michael C.

doi:10.1016/j.cplett.2009.09.095

Cited by 29 publications

(28 citation statements)

References 29 publications

(44 reference statements)

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“…They observed rapid quenching of O 2 (a 1 ∆) in O( 3 P)/O 2 /O 3 mixtures. It was found that the addition of Ar had no effect on the rate of O 2 (a 1 ∆) deactivation, whereas the addition of He and CO 2 decreased the quenching rate [19,20], in contradiction with expectations based on the 3BD mechanism. Attempts to model the fast decay using the 3BD mechanism yielded a rate constant of O 2 1 k =(1.1±0.1)×10 -31 cm 6 /s, which was inconsistent with the results of the flowing afterglow experiments.…”

Section: Introductioncontrasting

confidence: 61%

“…Vasiljeva et al [18] found that the O 2 (a 1 ∆) quenching rate in the discharge afterglow increases with oxygen pressure much faster than predictions based on the two-body quenching due to the components of an oxygen containing plasma (O, O 2 , O 3 etc.). They suggested that the faster deactivation of singlet oxygen at higher pressures was due to a three-body deactivation (3BD) process (reaction 1 in Table 1 [19,20] attempted to measure the rate constant of reaction 1 using pulsed laser photolysis of O 2 /O 3 mixtures at 248 nm to produce oxygen atoms and O 2 (a 1 ∆) molecules. They observed rapid quenching of O 2 (a 1 ∆) in O( 3 P)/O 2 /O 3 mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of oxygen species in an electrically driven singlet oxygen generator

et al. 2015

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Section: Introductioncontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Kinetics of oxygen species in an electrically driven singlet oxygen generator

et al. 2015

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“…essentially the same process that could account for the fast O (a) quenching reported by Azyazov et al [64] Downstream addition of NO to the discharge products resulted in increased O (a) production. Experiments were conducted over a range of total pressures, gas compositions and reaction times.…”

Section: Kinetics Issuesmentioning

confidence: 76%

“…In an attempt to isolate the three-body deactivation process, Azyazov et al [64] while quenching of O( D) by CO dominated when CO was present. O (a) was monitored using time-resolved measurements of the a-X fluorescence intensity.…”

Section: Kinetics Issuesmentioning

confidence: 99%

“…Kinetic modeling of the O (a) decay kinetics yielded a deactivation rate constant for M=O of cm s , which seems unreasonably high. Azyazov et al [64] speculated that quenching by vibrationally excited O may be important in the photolysis experiments. Additional studies of the three-body deactivation processes are needed to extract reliable rate constants for reaction (11).…”

Section: Kinetics Issuesmentioning

confidence: 99%

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Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Heaven

2010

Laser & Photonics Reviews

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Chemical oxygen-iodine lasers are unique in their ability to generate high-power beams with near diffraction limited beam quality. The operating wavelength, 1.315 μm is readily transmitted by the atmosphere and compatible with fiber optics beam delivery systems. However, applications of the laser are severely limited by logistical problems associated with the complex chemistry used to power the device. Electrical or microwave discharge excitation of oxygen-iodine lasers offers an attractive alternative that eliminates the chemical power generation problems and has the possibility of closedcycle operation. A discharge oxygen-iodine laser was first demonstrated in 2005. Since that time the power of the device has been improved by a factor of 400 and much has been learned concerning the physics and chemistry of the discharge driven system. Although our current understanding of the chemical kinetics is incomplete, parametric studies of laser performance show considerable promise for further scaling. This article reviews the basic principles of the discharge oxygen iodine laser, summarizes the most recent advances, and outlines some of the unresolved questions regarding the production and removal of excited species in the gas flow.

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Kinetics of Active Oxygen Species with Implications for Atmospheric Ozone Chemistry

Azyazov

2014

Int. J. Chem. Kinet.

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Photochemical processes involving singlet oxygen (O2(a1Δ)), oxygen atoms, and ozone are critical in determining atmospheric ozone concentrations. Here we report on kinetic measurements and modeling that examine the importance of the reactions of vibrationally excited ozone. Oxygen atoms and O2(a1Δ) were produced by UV laser photolysis of ozone. Time‐resolved absorption spectroscopy was used for O3 concentration measurements. It was found that vibrationally excited ozone formed by O + O2 + M → O3(ν) + M recombination reacts effectively with O2(a1Δ) and O atoms. The reaction O3(υ) + O2(a1Δ) → O + 2O2 results in a reduction of the ozone recovery rate due to O atom regeneration, whereas the reaction O3(υ) + O → 2O2 removes two odd oxygen species, resulting in incomplete ozone recovery. The possible impact of these reactions on the atmospheric O2(a1Δ) and O3 budgets at altitudes in the range of 80–100 km is considered.

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O2(a1Δ) quenching in the O/O2/O3 system

Cited by 29 publications

References 29 publications

Kinetics of oxygen species in an electrically driven singlet oxygen generator

Kinetics of oxygen species in an electrically driven singlet oxygen generator

Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Kinetics of Active Oxygen Species with Implications for Atmospheric Ozone Chemistry

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