An efficient singlet oxygen generator for chemically pumped iodine lasers

Richardson, R. J.; Wiswall, C. E.; Carr, P. A. G.; Hovis, Floyd E.; Lilenfeld, H. V.

doi:10.1063/1.329434

Cited by 36 publications

(4 citation statements)

References 7 publications

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“…Paramagnetism of O 2 (a 1 g ) due to its orbital moment is a base for application of the electron paramagnetic resonance technique for SDO monitoring. This method is most prominent in terms of reliability and accuracy [119,120] but needs apparatus not commonly available. Vacuum absorption spectroscopy is another accurate method.…”

Section: The Methods Of Sdo Detection and Calibration Of Measuring Sy...mentioning

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.

260

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: The Methods Of Sdo Detection and Calibration Of Measuring Sy...mentioning

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.

260

190

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“…The rate constants of homogeneous quenching are given in Table 1. To calculate the quenching rate constant on cylinder waIl we take the formula ki,wEd2p/32fl4 + (2-y')d/2yI/J'1 (9) where d is the diameter, p is the pressure (Torr), D1 is the diffusion constant, V is thegas-kinetic velocity, 1=2•10-is the coefficient of 02 deactivation on glass and y"=0.016 is the coefficient of 02(deactivation on glass.lf p is equal to 1 Torr then D is equal to 174 cm2/s.A kinetic model of gas flow through glass tubes was constructed.All quenching processes mentioned above (5)- (8) where taken into consideration within the model. By means of this model using the data from Fig.3 the 02 content was calculated at SOG output (Z0) taking Z, value measured at any distance x.Thus the value Z60=0.26 corresponds to the value of Z0 at various component concentrations in the (3) process showed that provided H202 is taken in high excess the °2 yield is practically independent on peroxide concentration in SOG; that is in agreement with'°.The 02 molecules yield in the (3) process in reaction mixture itself is close to 100%.…”

Section: Experimental Set-upfor Chemical Generation Of O'mentioning

confidence: 99%

<title>Investigation of various types of singlet-oxygen generators</title>

Kulagin¹,

Yarygina²,

Скоробогатов

1993

SPIE Proceedings

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By the means of combined calorimetric and luminescence method were investigated chemical singlet oxygen gas generators in which alkaline peroxide solution is replaced by solid peroxihydrate compounds; the operating principle of the generators is based on the interaction of powder peroxihydrates and gaseous chlorine or liquid chiorinecontaining reagents.The optimal composition of synthetized solid compounds allows hydrogen peroxide to be transformed into singlet oxygen with efficiency up to 100%.The usage of working solids in comparison with liquid ones has a number of advantages related to simplicity and safety in operation of such gas generators, significant consumption characteristic improvement and overall dimensions reduction, four times increase in singlet oxygen yield per unit weight of working components and water steam content minimizing in gas stream at the gas generator exit.

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“…Quenching of 1* by ICI will grow as ICI accumulates from the chain reactions (8) and (9), but the total rate of 1* decay can nonetheless decrease as reaction (10) More numerical integrations were performed to estimate the magnitude of k l9 required for sensible agreement with our experiments. Reactions (1)-(10), (16), and (19) were included, using rate constants from Table I and the reasonable (but not particularly critical) assumptions that k3 = k 4 ; k5 = k 6 . Simulating conditions comparable to those used to obtain the data of Fig.…”

Section: Chainmentioning

confidence: 99%

Collisional quenching of excited iodine atoms (5p5 2P1/2) by Cl2 in a flow system

Hall

Arepalli

Houston

et al. 1985

The Journal of Chemical Physics

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Quenching and reactions of laserexcited I(52 P 1/2) atoms with halogen and interhalogen molecules J. Chem. Phys. 69, 641 (1978); 10.1063/1.436629Collisional quenching of excited iodine atoms I(5p 5 2 P 1/2) by selected molecules Time-resolved infrared emission from photolytically generated I*ep 1/2) has been studied in a slow flow apparatus. The total rate of deactivation ofI*e P 1/2) by Cl 2 has been measured to be no more than 8X 10-15 cm 3 molecule-I S-I, substantially slower than previous reports. Evidence is presented for a very fast (k =2 X 10-10 cm 3 molecule-I S-I) relaxation of 1* by Cl atoms, which can account for both the earlier and the present observations.

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An efficient singlet oxygen generator for chemically pumped iodine lasers

Abstract: The results of a study on improved methods for generating O2(1Δ) are presented. A wetted-column reactor utilizing C12 and a mixed H2O2-NaOH solution as reactants was found to produce 70–80 mmole/s of O2, [50% as O2(1Δ)], with a C12 input of 90–100 mmole/s.

Cited by 36 publications

References 7 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

<title>Investigation of various types of singlet-oxygen generators</title>

Collisional quenching of excited iodine atoms (5p5 2P1/2) by Cl2 in a flow system

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