Study of water molecule decomposition in plasma by diode laser spectroscopy and optical actinometry methods

Bernatskiy, A. V.; Lagunov, V. V.; Очкин, В. Н.; Tskhaǐ, S. N.

doi:10.1088/1612-2011/13/7/075702

Cited by 11 publications

(3 citation statements)

References 12 publications

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“…The second facility with a glow discharge in the tube (Figs. 12, 13) is used to simulate conditions in the positive column and to compare different measurement methods [58,82,83,[168][169][170][171][172].…”

Section: Model Facilitiesmentioning

confidence: 99%

“…In the first channel, two O atoms are formed in the ground state, in the second channel, one of the atoms is in the electronically excited O ( 1 D) state. In the kinetic scheme, the same as in our previous works [49,56,57,72,82,83,171,172], the dissociation constant was taken equal to the sum of the constants of two channels.…”

Section: Measurements Of Concentrations Of Water Isotopomers In the Discharge Tubementioning

confidence: 99%

“…Results of the measurements of the concentration of water molecules N at different discharge currents. (1) Is the DLS method [82]; (2) is the actinometry method[82,83]; and (3) is the simulation result[83].…”

mentioning

confidence: 99%

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

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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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