Experimental investigation of decomposition of chlorofluorocarbons (CF2Cl2, CF4), as well as SiCl4 and SiF4 contained in an oxygen-hydrogen gaseous mixture, combustion of which is initiated by a high-current pulse slipping surface discharge, has been carried out.
It was found that a ternary gaseous mixture of oxygen+hydrogen+chlorine- and (or) fluorine-bearing gas, even with a large amount of the third component, maintains the explosion combustion property inherent in a binary hydrogen-oxygen mixture, based on the branched chain processes.
High-efficient (near complete) destruction of chlorine-fluorine-containing substances has been demonstrated.
Combustion dynamics was investigated. It was shown that initiation by slipping surface discharge combustion propagation behaviour has some peculiarities that are beyond the ordinary combustion wave or detonation wave mechanisms.
Peculiarities of the observed phenomena may be attributed to the strong UV irradiated by a high-current slipping surface discharge.
Kinetical scheme of the non-equilibrium nitrogen-oxygen mixtures.
The results of chemical reactions and thin film growth by means of freely localized space discharge excited by convergent pulsed microwave beams are presented. The main properties of microwave discharges are described. Original schemes for discharge excitation in both gas media and vacuum (a flare near the surface of a target irradiated by a powerful microwave beam) are given. The pulsed discharge occupies the near axis region of the vacuum chamber being located far away from the chamber walls. Thus, the main advantage of the scheme is the possibility to build, taking it as a basis, a super-pure plasmatron. The following operations demonstrate the possibilities of the microwave plasma reactor; volumetric quartz (SiO2) synthesis; volumetric production of pure SiC decomposition of CO2 production of diamond-like films on dielectric and metal substrates by chemical and physical vapour deposition.
Plasma–liquid interactions represent a growing interdisciplinary area of research involving plasma science, uid dynamics, heat and mass transfer, photolysis, multiphase chemistry and aerosol science. This review provides an assessment of the state-of-the-art of this multidisciplinary area and identi es the key research challenges. The developments in diagnostics, modeling and further extensions of cross section and reaction rate databases that are necessary to address these challenges are discussed. The review focusses on non- equilibrium plasmas.
Monte Carlo simulation was used to study the translational relaxation of energetic O− ions produced by dissociative electron attachment to O2 molecules in oxygen plasmas in a strong electric field. Initial O− ions have rather high energies and are more reactive than the ions reaching equilibrium with the electric field. Therefore, there is a noticeable probability that the energetic O− ions participate in endothermic reactions prior to energy relaxation of these ions. The probabilities of charge exchange, electron detachment and ion impact vibrational excitation of O2 molecules were calculated versus the reduced electric field. It was shown that up to 6% of energetic O− ions produced in oxygen by dissociative electron attachment to O2 molecules are rapidly transformed to ions due to charge exchange collisions. The probability of electron detachment from energetic O− ions and the probability of vibrational excitation were smaller that the probability of charge exchange. Estimates showed that the increase in the effective rates of the ion–molecule reactions due to high reactivity of energetic O− ions can be important in oxygen plasmas for reduced electric fields of 50–100 Td.