Investigation on mechanism of oxide removal and plasma behavior during laser cleaning on aluminum alloy

Parameters of the nanosecond overvoltage discharge plasma in an air gap of (1÷5) × 10−3 m between the electrodes, which contains the vapor of an electrode material (Zn, Cu, Fe) injected into plasma due to the ectonic mechanism, have been studied. The dependences of those parameters on the ratio E/N between the electric field strength E and the particle concentration N in the discharge are calculated for the “air–copper vapor” system, by using the numerical simulation method.

/pdf/parameters-of-nanosecond-overvoltage-discharge-plasma-in-a-3pf84ekl40.pdf

Parameters of Nanosecond Overvoltage Discharge Plasma in a Narrow Air Gap between the Electrodes Containing Electrode Material Vapor

The conditions for the synthesis of zinc, copper and iron oxides nanostructures using plasma nanosecond high-current discharge in air when introducing electrodes material vapor into a plasma due ectonic mechanism and the main parameters of the plasma are investigated. It is shown that this discharge can be used for the synthesis of nanoparticles of transition metal oxides on a dielectric substrate. Optical characteristics of nanostructures are given.

/pdf/synthesis-of-nanostructured-transition-metal-oxides-by-a-qu9j10qjuy.pdf

Synthesis of nanostructured transition metal oxides by a nanosecond discharge in air with assistance of the deposition process by plasma UV-radiation

/pdf/overstressed-nanosecond-discharge-in-the-gases-at-10bh7p9cri.pdf

Overstressed Nanosecond Discharge in the Gases at Atmospheric Pressure and Its Application for the Synthesis of Nanostructures Based on Transition Metals

Spectral and amplitude–time characteristics of radiation of plasma of a repetitively pulsed discharge initiated by runaway electrons were studied experimentally in nitrogen. Intense emission lines of copper atoms, nitrogen atoms, and ions, as well as the first and the second positive systems of nitrogen, NO, and CN, were observed in the regime of repetitively pulsed excitation.

Spectral and amplitude–time characteristics of radiation of plasma of a repetitively pulsed discharge initiated by runaway electrons

The emission spectra of a nanosecond discharge between copper electrodes in atmospheric-pressure air are studied at a high discharge gap overvoltage. The discharge was ignited between two cylindrical electrodes with a small radius of curvature of the working surface. Oscillograms of radiation pulses of spectral lines of copper atoms are also studied. The electron temperature averaged over the pulse is determined from the intensity distributions of the spectral lines of copper atoms.

Emission characteristics of the cathode region of nanosecond discharge in atmospheric-pressure air

Characteristics and parameters of nanosecond-discharge plasma in a system with sharply inhomogeneous distribution of the electric-field strength between CuInSe2 electrodes in atmospheric-pressure air are presented. The time dependence of the electron temperature is determined by analyzing the emission dynamics of electrode-erosion products from chalcopyrite at an interelectrode distance of 2 mm.

Characteristics and parameters of nanosecond air discharge plasma between chalcopyrite electrodes

The most intense spectral lines of In I (271.0, 293.3, 303.9, 410.2, 451.1 nm) and Cu I (324.8, 327.4, and 521.8 nm) emitted from the plasma plume of the laser erosion of a polycrystalline CuInSe2 target have been studied by time-resolved emission spectroscopy at a distance of 1 mm from the target. The kinetics of the spectral line intensity exhibits two maxima, the first of which is more pronounced for transitions from upper excited atomic states, while the second is more pronounced for transitions from lower energy states. It is established that the velocity of indium atoms in the plasma plume (83 and 14 km/s for species contributing to the first and second maximum, respectively) is greater than the corresponding velocities of copper atoms (63 and 12 km/s); the recombination time of singly charged indium ions (56 ns at a time of about 200 ns upon excitation) is smaller than that of singly charged copper ions (139 ns at a time of about 250 ns).

Studying the energy characteristics of laser erosion plasma of a CuInSe2 target by time-resolved emission spectroscopy

We report on the results of analysis of parameters of a laser-induced plasma, which were obtained using emission diagnostics of a laser torch plasma from a CuInSe2 polycrystalline target. The density and temperature of electrons in a laser torch with a complex composition are determined. The laser-induced plasma was formed in the near-threshold ablation conditions with a polycrystalline target used for obtaining thin films based on CuInSe2.

Parameters of a multicomponent laser-induced plasma

Oscillograms of the radiation of spectral lines of antimony and copper atoms from low-energy laser plasma of the polycrystalline CuSbSe2-based target at the distance of 1 mm from the surface are presented. The ion recombination time and the velocity of the laser plasma propagation are determined. The features of the time evolution of the radiation intensity of the spectral lines are analyzed.

Radiation dynamics of low-energy laser plasma of CuSbSe2 polycrystalline

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