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Шуаибов, А. К.; Shimon, L. L.; Dashchenko, A. I.; Чучман, М. П.

doi:10.1023/a:1017904811143

Cited by 3 publications

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“…The formation of only highly excited states of S atoms in the studied laser plasma and highly excited states of In atoms in plasma from the single-crystalline target leads to the conclusion that only ionized atoms dominate the plasma whereas a significant part of the neutral particles is located in the molecules and radicals. It is also noteworthy that a significant number of S ions is located on the leading edge of the laser plasma plume from CuInS 2 [17]. Similar results were obtained for laser ablation of YBa 2 Cu 3 O 7-x [18].…”

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Formation of excited states of atoms and ions in laser plasma from CuInS2

Чучман

Шуаибов

2008

J Appl Spectrosc

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Emission spectra and the energy distribution of the excited-state population density of atoms and ions in erosion laser plasma from CuInS 2 with various crystal-structure orderings are analyzed. It is shown that increased ordering of the target crystal structure causes the excited-state energies of indium atoms generated in the laser erosion plume to increase and that sulfur atoms always emit only in transitions from highly excited states. The ratio of relative ion concentrations in the laser plasma plume is Cu + /In + /S + = 0.3/0.08/2, which corresponds neither to the atomic ratio of Cu/In/S (1/1/2) in the target nor to the ratio of ionization energies. The results are explained by recombination processes for ions and by the atomization specifics of the CuInS 2 target exposed to long-wavelength radiation. The atomization consists essentially of dissociative processes expressed by CuInS 2 → CuInS + S and CuInS 2 → Cu + InS + S. The electron temperature of polycrystal (single-crystal) plasma at a distance of 1 mm from the target is 0.3 eV (0.4 eV) for atoms and 1.3 eV (2.7 eV) for ions and varies negligibly for plasma up to a distance of 7 mm from the target.Key words: erosion laser plasma, emission spectroscopy, excited-state population densities of atoms and ions, electron temperature, atomization of CuInS2 target. Introduction.Laser spectral analysis is one of the most common and reliable methods for finding the qualitative and quantitative compositions of matter [1]. The principal difficulties and therefore potential for increasing the information value of emission analysis of plasma produced by laser ablation of multi-component targets are explaining the atomization specifics of the target [1], forming excited states of atoms and ions [2], and knowing the space-time evolution of the laser plasma plume [3].The amount of various atoms vaporized from a target of a multi-component alloy can be found by knowing the fundamental thermal physical characteristics of the separate elements in the alloy. Thus, a coefficient normalizing the intensity ratio of diagnostic spectral lines for atoms of the various elements can be calculated in order to determine the stoichiometric ratio of these elements in the target [4]. Spectroscopic analysis for a multi-component chemical compound is complicated because of, first, specifics of the destruction of chemical bonds where, as shown previously [2], selective removal of ions from the surface of ionic crystals is possible through the action of laser radiation; second, the presence of many methods for destroying molecules, which the laser parameters facilitate [5]; and third, possibilities for chemical reactions on the surface of a multi-component target and in its vapor, especially with incoherent melting where the compound is separated into several phases of different compositions [6]. It was concluded [5] that Rydberg molecular states are formed through breakdown of molecular vapor by laser radiation. The decomposition of such molecules and their ionization and recombination det...

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“…These data were used to construct the energy distribution (E) of excited-state population densities for atoms and ions. The literature method [16] was used to determine the electron temperature of the laser plasma plume:…”

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Formation of excited states of atoms and ions in laser plasma from CuInS2

Чучман

Шуаибов

2008

J Appl Spectrosc

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“…The emission spectra of ablation plasmas of pure lead and gallium shows the most intense lines corresponding to transitions from lower excited states of ions and atoms, as well as from levels close to the bottleneck in the recombination flux of the atomic plasma component [10,11].…”

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The Emission Characteristics of Laser Plume from the PbGa2S4 Crystal Surface

Шуаибов

Чучман

2005

High Energy Chem

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Averaged spectra and oscilloscope traces of emission of laser plasma in vacuum produced by the impact of neodymium laser radiation ( τ = 20 ns, λ = 1.06 µ m, f = 12 Hz, W = 10 8 -10 9 W/cm 2 ) on Pb, Ga, and polycrystalline PbGa 2 S 4 targets were studied. From spectroscopic diagnostic data, the electron temperature, the recombination time of singly charged ions, and the number density of electrons in the laser plume of lead gallium sulfide were determined. An analysis of the results is given.

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“…The time resolution did not exceed 5-10 ns. The procedure of measuring the power of UV radiation of plasma, described in earlier papers [9,10], was based on selecting a small area of diameter d on the radiating surface of the discharge and treating it as a point area. After that, the radiation power was measured by the standard photometric procedure using a Kvarts-01 optical radiation power meter.…”

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Low-pressure ultraviolet emitter utilizing chlorine and krypton chloride molecules

2004

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Results are given of an investigation of the electrical and optical characteristics of the plasma of a longitudinal high-frequency discharge in a krypton/chlorine mixture (P ≤ 1000 Pa). The high-frequency discharge is ignited in a cylindrical quartz tube with an inside diameter of 14 mm and a distance between the anode and cathode of 30 mm. The dynamics of current and radiation of the high-frequency discharge utilizing krypton/chlorine mixtures of different compositions and pressures are investigated. It is found that a longitudinal high-frequency in a krypton/chlorine mixture is a broadband excimer-halogen emitter in the 200-260 nm spectral range. The ultraviolet spectrum of the lamp is formed as a result of overlapping of broadened radiation bands of chlorine and krypton chloride molecules (200 nm , 222 nm KrCl, and 257 nm ). The optimal composition of a Kr/Cl 2 mixture is determined, which is necessary to obtain the maximal power of ultraviolet radiation.

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Formation of excited states of atoms and ions in laser plasma from CuInS2

Formation of excited states of atoms and ions in laser plasma from CuInS2

The Emission Characteristics of Laser Plume from the PbGa2S4 Crystal Surface

Low-pressure ultraviolet emitter utilizing chlorine and krypton chloride molecules

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