Observations of gain on the I(P1∕22→P3∕22) transition by energy transfer from O2(aΔg1) generated by a microwave discharge in a subsonic-flow reactor

Rawlins, W. T.; Lee, S.; Kessler, William J.; Davis, S. J.

doi:10.1063/1.1861503

Cited by 79 publications

(102 citation statements)

References 13 publications

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“…[1][2][3][4][5] In these experiments, O 2 ͑a 1 ⌬ g ͒ and O 2 ͑X 3 ⌺ g − ͒ were produced in a chemical reaction 6,7 and the concentration of O 2 ͑a 1 ⌬ g ͒ was monitored by light emission, which was calibrated against an absolute standard. 8 Ionic reactants were present in much lower concentration, such that pseudofirst-order conditions were always established. The presence of electronic ground state oxygen does not pose a problem as long as the particular reaction with O 2 ͑X͒ is sufficiently slow compared to the analogous reaction with O 2 ͑a͒.…”

Section: Introductionmentioning

confidence: 99%

Dissociative excitation transfer in the reaction of O2(a1Δg) with OH−(H2O)1,2 clusters

Viggiano

Midey²,

Eyet³

et al. 2009

The Journal of Chemical Physics

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Rate constants for the dissociation of OH(-)(H(2)O) and OH(-)(H(2)O)(2) by transfer of electronic energy from O(2)(a(1)Delta(g)) were measured. Values of 1.8x10(-11) and 2.2x10(-11) cm(3) molecule(-1) s(-1), respectively, at 300 K were derived and temperature dependences were obtained from 300 to 500 K for OH(-)(H(2)O) and from 300 to 400 K for OH(-)(H(2)O)(2). Dissociative excitation transfer with OH(-)(H(2)O) is slightly endothermic and the reaction appears to have a positive temperature dependence, but barely outside the uncertainty range. In contrast, the reaction of OH(-)(H(2)O)(2) is exothermic and appears to have a negative temperature dependence. The rate constants are analyzed in terms of unimolecular rate theory, which suggests that the dissociation is prompt and is not affected by collisions with the helium buffer gas.

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Section: Introductionmentioning

confidence: 99%

Dissociative excitation transfer in the reaction of O2(a1Δg) with OH−(H2O)1,2 clusters

Viggiano

Midey²,

Eyet³

et al. 2009

The Journal of Chemical Physics

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“…The lasing state I ‫ء‬ is produced by near resonant energy transfer with the singlet oxygen metastable O 2 ͑a 1 ⌬͒ ͓denoted hereafter as O 2 ͑ 1 ⌬͔͒. Subsequent efforts have demonstrated gain [3][4][5] and lasing [4][5][6] in other ElectricOIL configurations since the first demonstrations. Ionin et al 7 provided a comprehensive topical review of discharge production of O 2 ͑ 1 ⌬͒ and various ElectricOIL studies.…”

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confidence: 99%

Gain recovery in an electric oxygen-iodine laser

Zimmerman

Benavides

Palla

et al. 2009

Applied Physics Letters

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Recent investigations of an electric oxygen-iodine laser system have shown that computational modeling overpredicts the experimentally measured power output for similar gain conditions. This discrepancy is potentially due to an unknown reaction that competes with the forward pumping of I(P21/2) by O2(a Δ1). Measurements of gain recovery downstream of an operating laser cavity were performed. Modeling of this experiment shows that reducing the forward pumping rate by an effective factor of approximately 4 to simulate a competing mechanism results in the computational modeling matching the experimental gain recovery measurements, and in improved agreement between the measured and modeled laser power extraction.

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“…Oxygen containing discharges and their afterglows have a wide range of applications due to the presence of active O( 3 P) and O( 1 D) atoms [1,2,3], excited O 2 (a 1 ∆ g ) molecules [4,5,6,7], and the ground-state O 2 (X 3 Σ − g ,v), which together with Ar + have been proven to be able to inactivate bacteria spores [8]. O 2 and Ar-O 2 plasmas have been successfully used for oxide films deposition [9,10], synthesis of metal oxide nanowires [11], sterilization and decontamination of medical instruments [1,12,13,14,15] and polymer surface treatment [3,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Theoretical insight into Ar–O₂surface-wave microwave discharges

Kutasi

Guerra²,

Sá

2010

J. Phys. D: Appl. Phys.

104

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Abstract.A zero-dimensional kinetic model has been developed to investigate the coupled electron and heavy-particle kinetics in Ar-O 2 surface-wave microwave discharges generated in long cylindrical tubes, such as those launched with a surfatron or a surfaguide. The model has been validated by comparing the calculated electron temperature and species densities with experimental data available in the literature for different discharge conditions. Systematic studies have been carried out for a surfacewave discharge generated with 2.45 GHz field frequency in a 1 cm diameter quartz tube in Ar-O 2 mixture at 0.5-3 Torr pressures, which are typical conditions found in different applications. The calculations have been performed for the critical electron density n e =3.74×10 11 cm −3 . It has been found that the sustaining electric field decreases with Ar percentage in the mixture, while the electron kinetic temperature exhibits a minimum at about 80%Ar. The charged and neutral species densities have been calculated for different mixture compositions, from pure O 2 to pure Ar, and their creation and destruction processes have been identified. The O 2 dissociation degree increases with Ar addition into O 2 and dissociation degrees as high as 60% can be achieved. Furthermore, it has been demonstrated that the dissociation degree increases with the discharge tube radius, while decreases with the atomic surface recombination of O-atoms. The density of O − negative ions is very high in the plasma, the electronegativity of the discharge can be higher than 1, depending on the discharge conditions. §

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Observations of gain on the I(P1∕22→P3∕22) transition by energy transfer from O2(aΔg1) generated by a microwave discharge in a subsonic-flow reactor

Cited by 79 publications

References 13 publications

Dissociative excitation transfer in the reaction of O2(a1Δg) with OH−(H2O)1,2 clusters

Dissociative excitation transfer in the reaction of O2(a1Δg) with OH−(H2O)1,2 clusters

Gain recovery in an electric oxygen-iodine laser

Theoretical insight into Ar–O₂surface-wave microwave discharges

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Observations of gain on the I(P1∕22→P3∕22) transition by energy transfer from O2(aΔg1) generated by a microwave discharge in a subsonic-flow reactor

Cited by 79 publications

References 13 publications

Dissociative excitation transfer in the reaction of O2(a1Δg) with OH−(H2O)1,2 clusters

Dissociative excitation transfer in the reaction of O2(a1Δg) with OH−(H2O)1,2 clusters

Gain recovery in an electric oxygen-iodine laser

Theoretical insight into Ar–O2surface-wave microwave discharges

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Product

Resources

About

Theoretical insight into Ar–O₂surface-wave microwave discharges