Improved rf plasma jet generation of singlet delta oxygen

Schmiedberger, Josef; Takahashi, Sanyo; Fujii, Hiroo

doi:10.1117/12.270166

Cited by 8 publications

(13 citation statements)

References 2 publications

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“…RF discharge also looks very attractive for SDO excitation because it can be used like a MW discharge in a way of excitation when electrodes are out of the gaseous medium under excitation, and, hence, can prevent this medium from contamination by electrode materials. Nonetheless, some experiments on RF discharge SDO excitation, also stimulated by the idea of launching DOIL, were carried out as RF discharge electrodes were in contact with oxygen and its mixtures with buffer gases [113,[192][193][194][195][196][197][198][199]. For ten years a set of five SDO RF discharge electric generators (discharge singlet oxygen generator (DSOG)) were manufactured by the above authors and described in their papers.…”

Section: Experimental Methods Of Sdo Production In An Electric Dischargementioning

confidence: 99%

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

263

190

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An overview is presented of experimental and theoretical research in the field of physics and engineering of singlet delta oxygen (SDO) production in low-temperature plasma of various electric discharges. Attention is paid mainly to the SDO production with SDO yield adequate for the development of an electric discharge oxygen–iodine laser (DOIL). The review comprises a historical sketch describing the main experimental results on SDO physics in low-temperature plasma obtained since the first detection of SDO in electric discharge in the 1950s and the first attempt to launch a DOIL in the 1970s up to the mid-1980s when several research groups started their activity aimed at DOIL development, stimulated by success in the development of a chemical oxygen–iodine laser (COIL). A detailed analysis of theoretical and experimental research on SDO production in electric discharge from the mid-1980s to the present, when the first DOIL has been launched, is given. Different kinetic models of oxygen low-temperature plasma are compared with the model developed by the authors. The latter comprises electron kinetics based on the accompanying solution of the electron Boltzmann equation, plasma chemistry including reactions of excited molecules and numerous ion–molecular reactions, thermal energy balance and electric circuit equation. The experimental part of the overview is focused on the experimental methods of SDO detection including experiments on the measurements of the Einstein coefficient for SDO transition and experimental procedures of SDO production in self-sustained and non-self-sustained discharges and analysis of different plasma-chemical processes occurring in oxygen low-temperature plasma which brings limitation to the maximum SDO yield and to the lifetime of the SDO in an electric discharge and its afterglow. Quite recently obtained results on gain and output characteristics of DOIL and some projects aimed at the development of high-power DOIL are discussed.

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Section: Experimental Methods Of Sdo Production In An Electric Dischargementioning

confidence: 99%

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

263

190

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“…[6][7][8][9][10][11][12][13][14][15][16][17] The RF plasma jet devices appeared to be a suitable source of O 2 ( 1 ∆) for a DOIL. The devices were based on a RF hollow electrode, which produced a plasma jet.…”

Section: Rf Plasma Jet Dsogmentioning

confidence: 99%

Initial development of hybrid plasma jet generator of O 2 (¹Δ) for DOIL

et al. 2008

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The initial stage in development of hybrid plasma jet generator of singlet oxygen O 2 ( 1 ∆) for a discharge oxygen-iodine laser (DOIL) is presented. This novel type of generator is based on a fast mixing of hybrid argon plasma jet of DC electric arc and RF discharge with a neutral molecular oxygen stream. Arc plasma jets have a much higher density of electrons than RF plasma jets to compensate the electro-negativity of oxygen and they can be operated at a higher pressure for an efficient supersonic expansion cooling in DOIL. An RF discharge is applied to the DC arc plasma jet at the hollow anode of the plasmatron to switch it from a hot-spot mode to a diffusive mode. That is advantageous with the use of aluminum anode, which has a lower melting point and a significantly lower rate of O 2 ( 1 ∆) quenching compared to a standard copper anode in a gas plasmatron. An enhanced non-equilibrium in the plasma jet caused by the RF discharge and neutral oxygen injection is desirable for an efficient O 2 ( 1 ∆) generation. Preliminary calculations on the equilibrium composition of O 2 -Ar mixture suggest keeping the arc temperature well down to prevent an excessive dissociation of the molecular oxygen.

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“…Oxygen−iodine lasers that utilize electrical or microwave discharges to produce singlet oxygen are currently being investigated. At present, the highest singlet oxygen yield at the output of an electrically powered singlet oxygen generator is about 15−20%. − With post-discharge addition of I 2 to the flow, positive gain on the I( 2 P 1/2 ) → I( 2 P 3/2 ) electronic transition at 1315 nm has been measured for both supersonic and subsonic 4 flow conditions. Recently Carroll et al reported the first demonstration of an electrically powered oxygen−iodine laser (EOIL) using supersonic flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Quenching of I(²P_1/2) by O₃ and O(³P)

Azyazov

Antonov

2007

J. Phys. Chem. A

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Oxygen-iodine lasers that utilize electrical or microwave discharges to produce singlet oxygen are currently being developed. The discharge generators differ from conventional chemical singlet oxygen generators in that they produce significant amounts of atomic oxygen. Post-discharge chemistry includes channels that lead to the formation of ozone. Consequently, removal of I(2P1/2) by O atoms and O3 may impact the efficiency of discharge driven iodine lasers. In the present study, we have measured the rate constants for quenching of I(2P1/2) by O(3P) atoms and O3 using pulsed laser photolysis techniques. The rate constant for quenching by O3, (1.8 +/- 0.4) x 10(-12) cm3 s-1, was found to be a factor of 5 smaller than the literature value. The rate constant for quenching by O(3P) was (1.2 +/- 0.2) x 10(-11) cm3 s-1.

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Improved rf plasma jet generation of singlet delta oxygen

Cited by 8 publications

References 2 publications

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Initial development of hybrid plasma jet generator of O 2 (¹Δ) for DOIL

Quenching of I(²P_1/2) by O₃ and O(³P)

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Improved rf plasma jet generation of singlet delta oxygen

Cited by 8 publications

References 2 publications

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Initial development of hybrid plasma jet generator of O 2 (1Δ) for DOIL

Quenching of I(2P1/2) by O3 and O(3P)

Contact Info

Product

Resources

About

Initial development of hybrid plasma jet generator of O 2 (¹Δ) for DOIL

Quenching of I(²P_1/2) by O₃ and O(³P)