Transformations of neutral particles in the discharge plasma in inert gases with water vapor and deuterium

Abstract

The chemical composition of the discharge plasma in inert gases with H2O and D2 additives is investigated experimentally and theoretically for the first time. A new approach is applied to the measurement of the concentrations of plasma-produced particles. It includes the combination of the optical multispectral actinometry technique and the concept of intermediate chemically active actinometers. The scheme of the chemical processes in the plasma is elaborated. The dynamics and steady state concentrations of near 20 atomic and molecular particles are described. The experimental data on particle densities are in good agreement with the calculated values. The data on stationary particle concentrations with a variation of H2O (106–1016) cm−3 and D2 (1012–1016) cm−3 are presented. Within these limits, the concentrations of chemically active atoms as well as 2-, 3-, and 4-atomic molecules are in the (103–9.6 × 1015) cm−3 interval. The use of the new improved technique of actinometry combined with the modeling code significantly extends the capabilities of the highly sensitive spectral emission technique for the analysis of the chemical composition of the multi-component plasma.

Determination of water leaks flows and their surface localization in plasma reactors by the ratio of the hydrogen isotopes line intensities

“…It is based on measuring the intensities of the lines of a large number of particles, including stable inert atoms, which can be considered as the 'main participants', together with other particles that can be chemically active. The latter are used as 'intermediate' actinometers in pairs with chemically active particles of another kind [6,9]. The relation Figure 1.…”

“…PS-discharge power supply, P-probe, VIC -system for probe voltage supply and signal processing, L-optical system, S+PhC-spectrometer and/or fast photo camera, DE-digital electronics, PC-computer. between the densities N X,A of X-and A-type particles is [6,9] n n…”

“…Thus, in [8], the sensitivity Q=10 -7 Pa m 3 s -1 was achieved. Based on the results of these experimental works, it was possible to develop and confirm a model of plasma-chemical processes involving water molecules [6,8,9], which is important, among other things, for coordinating the results obtained in other various experiments.…”

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

“…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.…”

“…The rate constants of processes involving heavy particles: atoms, molecules and radicals,-and their temperature dependences in the gas phase, taken from [56], are given in Table 9.…”