Oxygen–iodine laser with a photodissociation source of excited O2(a1Δg) oxygen

Золотарев, В А; Kryukov, P. G.; Podmar’kov, Yu P; Фролов, М П; Yuryshev, Nikolai N

doi:10.1070/qe1989v019n06abeh008112

Cited by 5 publications

(7 citation statements)

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“…The relatively high yield of O 2 (a) raises the possibility that reaction 6 may contribute to the Earth's airglow. Confirmation that O 2 (a) is produced by O( 1 D) + N 2 O also explains the results of Zolotarev et al 13,14 who found that adding N 2 O to I 2 /O 3 mixtures improved the performance of the photolysis-initiated laser. It will be of interest to re-evaluate the potential of this type of device using the branching fraction and rate constant data determined in this study.…”

Section: Discussionsupporting

confidence: 62%

“…In a related earlier study, Zolotarev and co-workers − concluded that the presence of O atoms was responsible for the low efficiency of an OIL system that was powered by the photolysis of O 3 .…”

Section: Introductionmentioning

confidence: 99%

“…As noted above, they observed I* luminescence when N 2 O/CO 2 /CF 3 I or N 2 O/N 2 /CF 3 I mixtures were photolyzed using a 193 nm light, and it was clear from the time evolution that I* was being formed by secondary reactions. In attempts to improve the performance of the OIL powered by O 3 photolysis, Zolotarev et al 13 tested the use of N 2 O, N 2 , and/or CO 2 as reagents for the removal of O( 1 D), and the best results were obtained for N 2 O. Zolotarev et al 14 concluded that an increase in laser power was achieved due to the fact that N 2 O consumes oxygen atoms in process 6 and that O 2 (a) is produced by reaction 6b. Note that the yield of O 2 (a) from reaction 6b is also of interest from the perspective of atmospheric chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of O₂(aΔ_g) and I(²P_1/2) in the Photochemistry of N₂O/I₂ Mixtures

2007

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The recent demonstration of a discharge-driven oxygen-iodine laser has generated renewed interest in the kinetics of iodine interacting with electronically excited O2 and atomic O. Kinetic measurements that are of relevance to the laser have been carried out using 193 nm pulsed laser photolysis of N2O/I2/CO2 mixtures. Singlet oxygen was generated in this system by the reaction O(1D)+N2O-->O2(a1Deltag, X3Sigma-g)+N2. The fraction of electronically excited O2 produced by this channel was shown to be >0.9. The secondary photochemistry of the N2O/I2/CO2 system was characterized by monitoring the time histories of I(2P1/2), I2, IO, and O2(a). Kinetic modeling of these data was used to determine the rate constant for the deactivation of I(2P1/2) by O(3P) (k=(1.2+/-0.1)x10(-11) cm3 s(-1)). Quenching of I(2P1/2) by O(3P) is suppressed in the discharge-driven laser by using NO2 to scavenge the O atoms. The reaction O(3P)+NO2-->O2+NO is sufficiently exothermic for the production of O2(a), and it has been speculated that this channel may be significant in the laser excitation kinetics. Photolysis of NO2 was used to probe this reaction. O2(a) was not detected, and an upper bound of <0.1 for its production in the reaction of O(3P) or O(1D) with NO2 was established.

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Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics of O₂(aΔ_g) and I(²P_1/2) in the Photochemistry of N₂O/I₂ Mixtures

2007

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“…Quenching of I* by N 2 O was studied both for fundamental reasons and because of the relevance to a particular type of photolytically driven oxygen-iodine laser. Zolotarev et al 10 explored a laser scheme where photolysis of O 3 was used as the primary source of O 2 (a). In attempts to improve the performance of this system, Zolotarev et al 10 tested the use of N 2 O, N 2 , and/or CO 2 as reagents for removal of the unwanted O( 1 D) photoproduct.…”

Section: Introductionmentioning

confidence: 99%

“…Zolotarev et al explored a laser scheme where photolysis of O 3 was used as the primary source of O 2 ( a ). In attempts to improve the performance of this system, Zolotarev et al tested the use of N 2 O, N 2 , and/or CO 2 as reagents for removal of the unwanted O( 1 D) photoproduct. The best results were obtained for N 2 O, and Zolotarev et al concluded that an increase in laser power was achieved due to the fact that N 2 O consumes oxygen atoms in processes where O 2 ( a ) is the dominant product of reaction 6b.…”

Section: Introductionmentioning

confidence: 99%

Quenching of I(²P_1/2) by NO₂, N₂O₄, and N₂O

Kabir

Azyazov

2007

J. Phys. Chem. A

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Quenching of excited iodine atoms (I(5p5, 2P1/2)) by nitrogen oxides are processes of relevance to discharge-driven oxygen iodine lasers. Rate constants at ambient and elevated temperatures (293-380 K) for quenching of I(2P1/2) atoms by NO2, N2O4, and N2O have been measured using time-resolved I(2P1/2) --> I(2P3/2) 1315 nm emission. The excited atoms were generated by pulsed laser photodissociation of CF3I at 248 nm. The rate constants for I(2P1/2) quenching by NO2 and N2O were found to be independent of temperature over the range examined with average values of (2.9 +/- 0.3) x 10(-15) and (1.4 +/- 0.1) x 10(-15) cm3 s(-1), respectively. The rate constant for quenching of I(2P1/2) by N2O4 was found to be (3.5 +/- 0.5) x 10(-13) cm3 s(-1) at ambient temperature.

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Influence of atomic oxygen on the dissociation of molecular iodine and dissipation of the energy stored in the active medium of an oxygen–iodine laser

Золотарев¹,

Ishkov²,

Podmar’kov³

et al. 1991

Sov. J. Quantum Electron.

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We give examples of string compactifications to 4d Minkowski space with different amounts of supersymmetry that can be connected by spherical domain walls. The tension of these domain walls is tunably lower than the 4d Planck scale. The "stringy" description of these walls is known in terms of certain configurations of wrapped Dirichlet and NS branes. This construction allows us to connect a variety of vacua with 4d N = 4, 3, 2, 1 supersymmetry.

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Oxygen–iodine laser with a photodissociation source of excited O₂(a¹Δ_g) oxygen

Cited by 5 publications

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Kinetics of O₂(aΔ_g) and I(²P_1/2) in the Photochemistry of N₂O/I₂ Mixtures

Kinetics of O₂(aΔ_g) and I(²P_1/2) in the Photochemistry of N₂O/I₂ Mixtures

Quenching of I(²P_1/2) by NO₂, N₂O₄, and N₂O

Influence of atomic oxygen on the dissociation of molecular iodine and dissipation of the energy stored in the active medium of an oxygen–iodine laser

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Oxygen–iodine laser with a photodissociation source of excited O2(a1Δg) oxygen

Cited by 5 publications

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Kinetics of O2(aΔg) and I(2P1/2) in the Photochemistry of N2O/I2 Mixtures

Kinetics of O2(aΔg) and I(2P1/2) in the Photochemistry of N2O/I2 Mixtures

Quenching of I(2P1/2) by NO2, N2O4, and N2O

Influence of atomic oxygen on the dissociation of molecular iodine and dissipation of the energy stored in the active medium of an oxygen–iodine laser

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Product

Resources

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Oxygen–iodine laser with a photodissociation source of excited O₂(a¹Δ_g) oxygen

Kinetics of O₂(aΔ_g) and I(²P_1/2) in the Photochemistry of N₂O/I₂ Mixtures

Kinetics of O₂(aΔ_g) and I(²P_1/2) in the Photochemistry of N₂O/I₂ Mixtures

Quenching of I(²P_1/2) by NO₂, N₂O₄, and N₂O