Dissociation of carbon dioxide and inversion in CO&amp;lt;inf&amp;gt;2&amp;lt;/inf&amp;gt;laser

Lotkova, E. N.; Очкин, В. Н.; Соболев, Н. Н.

doi:10.1109/jqe.1971.1076813

Cited by 20 publications

(3 citation statements)

References 17 publications

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“…It is not necessary that the mechanisms in low-pressure, low-current discharges in initially pure CO2 should be the same as those in the higher currents of flowing-gas continuous (5-20 mA cm-2) or pulsed (0.1-100 A cm-2) laser devices which operate with the carbon dioxide considerably diluted with nitrogen and helium at a total pressure of 10-30 Torr. Even so, the results of Corvin and Corrigan have been extrapolated to both these types of device (Wiegand et al 1970, Booth and Gibbs 1970, Lotkova et al 1971. We have examined these extrapolations by measuring the dissociation rates in various flowing-gas mixtures similar to those used in actual lasers, both for continuous and pulsed discharges.…”

Section: Introductionmentioning

confidence: 99%

Dissociation mechanism in pulsed and continuous CO2 lasers

Smith

Austin

1974

J. Phys. D: Appl. Phys.

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The dissociation of carbon dioxide in the positive column of a glow discharge has been measured in CO2 and in CO2-N2 and CO2-N2-He mixtures as used in low-pressure (1-20 Torr) gas lasers. Both for continuous and pulsed discharges the measured dissociation rate is proportional to the electron density. The dissociation coefficient increases with the reduced field strength E/p, but for a given E/p it is very much greater for CO2-N2-He than for CO2-N2, and is greater for CO2-N2 than for CO2. This variation is consistent with the variation of the electron energy distribution and drift velocity with the different gases, and it is not necessary to postulate more than one dissociation mechanism.

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Section: Introductionmentioning

confidence: 99%

Dissociation mechanism in pulsed and continuous CO2 lasers

Smith

Austin

1974

J. Phys. D: Appl. Phys.

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“…(It is noteworthy that most of these metals and oxides also act as catalysts for the CO oxidation reaction. The fact that the degree of CO_ dissociation is indeed affected by the cathode surface chosen is also documented in the literature [ 6] . ) The use of one of these materials as a cold cathode exposes it to additional processes such as ion bombardment, photo-, fieldand thermal emission with the result that the surface has a tendency to stay ,in the higher oxidation state.…”

Section: LImentioning

confidence: 60%

Cold cathodes for sealed-off CO₂ lasers

Hochuli

Sciacca²

1973

IEEE J. Quantum Electron.

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“…The accuracy of any measurement is finite. If the concentration of particles of one kind is determined independently by several (M) actinometers, and the results differ within the limits allowed by the accuracy of the intensity measurements and the discrepancy between the cross-sectional data in different sources without justified preference, the arithmetic mean is taken (39) The second approximation takes into account the fact that, in addition to the initial ones, other particles…”

Section: Multispectral Actinometrymentioning

confidence: 99%

Spectral Methods of Control of Impurities, Their Flows and Localization in an Equilibrium Low-Temperature Plasma of Low Pressure

2020

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The state-of-art of studies of processes involving small fractions of particles formed as a result of chemical transformations of the source gas or appearing from the outside as an impurity is discussed. Various high-sensitivity methods for measuring the low concentrations of particles are considered. The main focus is on spectral methods, both classical and laser ones. The main modern fields of the application of non-equilibrium plasma, features, and achievements of the diagnostic tools used in them are highlighted. The emphasis is on spectroscopic studies of plasma purity in the low-temperature near-wall layers of thermonuclear reactors. In this case, the issue of the penetration of water molecules into the plasma chamber from the cooling circuits is of particular importance. In view of the limited accessibility to the reactors, new remote versions of spectral emission methods are being developed that are focused on the diagnostics of the ITER near-wall plasma. A new method of multispectral optical actinometry is discussed, in which intermediate chemically unstable particles can play the role of actinometers. This broadens the range of possibilities for quantitative measurements of concentrations of particles of different kinds, and increases the sensitivity. Effective actinometric pairs were found for the objects under consideration, e.g., hydrogen and deuterium atoms. The schemes are worked out on laboratory facilities, and kinetic models of plasma-chemical processes are developed. Scaling of the results of model experiments makes it possible to predict the measurement of the impurity flows at the level (10–9–10–13) Pa m3 s–1 with the localization of sources determined by the spatial resolution of the optical system.

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Dissociation of carbon dioxide and inversion in CO<inf>2</inf>laser

Cited by 20 publications

References 17 publications

Dissociation mechanism in pulsed and continuous CO2 lasers

Dissociation mechanism in pulsed and continuous CO2 lasers

Cold cathodes for sealed-off CO₂ lasers

Spectral Methods of Control of Impurities, Their Flows and Localization in an Equilibrium Low-Temperature Plasma of Low Pressure

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Dissociation of carbon dioxide and inversion in CO&lt;inf&gt;2&lt;/inf&gt;laser

Cited by 20 publications

References 17 publications

Dissociation mechanism in pulsed and continuous CO2 lasers

Dissociation mechanism in pulsed and continuous CO2 lasers

Cold cathodes for sealed-off CO2 lasers

Spectral Methods of Control of Impurities, Their Flows and Localization in an Equilibrium Low-Temperature Plasma of Low Pressure

Contact Info

Product

Resources

About

Dissociation of carbon dioxide and inversion in CO<inf>2</inf>laser

Cold cathodes for sealed-off CO₂ lasers