Plasma Parameters around a Chain-Like Structure of Dust Particles in an External Electric Field

The formation of a 1D chain-like structure of dust particles in a low-temperature argon plasma was studied. A new numerical model for calculation of the self-consistent spatial distribution of plasma parameters around a chain of dust particles was presented. The model described the motion of positively charged ions in the electric potential of several negatively charged dust particles, taking into account the action of an external electric field. The main advantage of the model was that the charges of the dust particles and the interparticle distances were determined self-consistently. As a result of numerical simulations, the dependencies of the spatial distributions of the plasma parameters (the densities of electrons and ions and the self-consistent electric potential) near the dust particles chain on the strength of the external electric field, an external force acted on the last particle, and the mean free path of the ions was determined. The obtained results made it possible to describe the process of the formation of chain-like structures of dust particles in discharge plasma.     

Crystal Structure of Praseodymium(III) Complex [Pr(DMSO)8]2PMo10V2O40(NO3) · DMSO (DMSO = Dimethyl Sulfoxide)

Crystal structure of [Pr(DMSO)₈]₂PMo₁₀V₂O₄₀(NO₃) · DMSO (where DMSO is dimethyl sulfoxide) is determined by X-ray diffraction analysis. The Pr atom forms coordination polyhedron shaped like a distorted square antiprism with Pr–O distances varying from 2.432(6) to 2.476(6) Å. The oxygen atoms of a heteropolyanion are not involved in the coordination sphere of the Pr atom.     

Interaction of a laser pulse with high-temperature-superconducting target Y-Ba-Cu-O

The interaction of a laser pulse with a high-temperature-superconducting target is studied on the basis of the heat conduction equation. It is found that the surface layer of the target overheats at certain radiation intensities. This overheating in turn disturbs the metastable state of the material and results in its explosive ejection from the surface.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 3–6, August, 1993.     

Synthesis and the crystal structure of aqua-dioxo-nitrato-(2,2′,6′,2″-terpyridine)-neptunium(V) [NpO2(NO3)(terpy)(H2O)]

The crystal structure of the [NpO₂(NO₃)(Terpy)(H₂O)] complex between pentavalent neptunium and 2,2′,6′,2″-terpyridine is determined. The crystal data are as follows: a = 11.130(3) Å, b = 7.916(2) Å, c = 18.324(5) Å, β = 100.873(6)°, V = 1585.5(8) ų, Z = 4, space group is P2₁/n, R = 0.044, and wR(F ²) = 0.092. The coordination polyhedron of the Np atom is a pentagonal bipyramid whose equatorial plane includes three nitrogen atoms of the Terpy molecule and two oxygen atoms of the nitrate ion and the water molecule.     

Volatile einsteinium hexafluoroacetylacetonate complexes

Volatile einsteinium hexafluoroacetylacetonate complexes have been syntehsized. Their sublimation and thermochromatographic behaviour has been studied in the presence of -diketone vapours. Interaction of einsteinium di-and trichloride with hexafluoracetylacetone vapours is discussed.     

Diamond oxidation in positive column of glow discharge

Conclusions A study was made of the reaction rate of a natural diamond monocrystal with air and with CO₂ -enriched air, and the values of the activation energy were determined in the temperature range 550–800° and a pressure of 1.2 torr.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 931–933, April, 1977.     

Diffusion rate in diamond growth

Conclusions Equations were established that relate the growth rate of diamond crystals in the region of its thermodynamic stability to the synthesis time.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2647–2649, November, 1978.