Karlygash N Dzhumagulova

• Al-Farabi Kazakh National University

This study examines the emergence of an ionization-attachment plasma instability in a geometrically symmetric capacitively coupled plasma (CCP) reactor with stainless steel electrodes operated in oxygen. Periodic fluctuations in optical emission intensity were observed under varying conditions of pressure and voltage. To interpret the experimental...

In this work, we present an improved model for ionization potential depression (IPD) in dense plasmas that builds upon the approach introduced by Lin et al., which utilizes a dynamical structure factor (SF) to account for ionic microfield fluctuations. The main refinements include: (1) replacing the Wigner–Seitz radius with an ion-sphere radius, th...

Using the optical interaction potential between an electron and a helium atom, we have calculated the momentum-transfer cross-section, collision frequency, and energy transfer rate during elastic electron–helium scattering, focusing on energies up to the ionization threshold of helium (24.6 eV). The interaction potential includes static, polarizati...

We present a method for the in-situ determination of the effective secondary electron emission coefficient (SEEC, γ) in a capacitively coupled plasma (CCP) source based on the γ-dependence of the DC self-bias voltage that develops over the plasma due to the electrical asymmetry effect (EAE). The EAE is established via the simultaneous application o...

Cubic halide based perovskite gained the attention of the researchers due to their remarkable optoelectronic contributions. The present work deals with the first principles calculations based on Density Functional Theory for exploring the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssy...

Application of various electron-transport layers (ETLs) with desired morphology and dimensions is a key factor to be considered for the structural designs of perovskite solar cells (PSCs) in order to obtain enhanced optical and electrical properties. The metal-oxide ETLs composed of one-dimensional nanorod arrays are one of the most frequently used...

Perovskite solar cells (PSCs), prepared by using solution-processed printing techniques, gained much attention over the past few years and a considerable progress has been achieved in improving the power conversion efficiencies of these devices. Nevertheless, there are still some advancements that can be implemented, especially in terms of passivat...

We obtained an expression for the Coulomb logarithm for a dense semiclassical plasma based on momentum transport cross sections using an effective interaction potential. It was shown that for densities and temperatures corresponding to the dense semiclassical plasma our results are in good agreement with MD simulations. We applied the Coulomb logar...

Modified versions of the dynamic effective interaction potentials for the charged particles in dense semiclassical plasma are presented. These models consider dynamic screening, quantum mechanical effect of diffraction and particle velocity distribution function with non-Maxwellian suprathermal tail. Such distributions are well described by the so-...

Perovskites are a promising class of semiconductor materials, which are being studied intensively for their applications in emerging new flexible optoelectronic devices. In this paper, device manufacturing and characterization of quasi-interdigitated back-contact perovskite solar cells fabricated on flexible substrates are studied. The photovoltaic...

In this work, the interaction potential of dense plasma particles, which takes into account the effect of quantum non‐locality as well as electronic correlations, was used to solve the Schrödinger equation for the hydrogen atom. Energies of bound states were calculated. The results obtained are in good agreement with the results of other authors.

We present the effective optical potential of the interaction of an electron with an atom in dense semiclassical plasma of noble gases. This potential takes into account the collective screening effect and the quantum mechanical effect of diffraction. The influence of diffraction and screening effects on the characteristics of electron–atom collisi...

The effective optical potential of the electron–atom interaction in dense semiclassical helium plasma is derived. The Hartree–Fock, polarization, and exchange potentials consider the collective screening effect and the quantum-mechanical effect of diffraction. It was shown that when three components of the optical potential act together the charact...

Back-contact design for the architecture of devices is a promising approach to develop high-performance perovskite solar cells. Here, numerical simulation methods are used to investigate device properties of back-contact perovskite solar cells (BC–PSCs) with the quasi-interdigitated, flat-interdigitated, and interdigitated electrode designs. The re...

In this work, we analyze the creation of the discharge asymmetry and the concomitant formation of the DC self-bias voltage in capacitively coupled radio frequency plasmas driven by multi-frequency waveforms as a function of the electrode surface characteristics. For the latter, we consider and vary the coefficients that characterize the elastic ref...

In this work, we analyze the creation of the discharge asymmetry and the concomitant formation of the DC self-bias voltage in capacitively coupled radio frequency plasmas driven by multi-frequency waveforms, as a function of the electrode surface characteristics. For this latter, we consider and vary the coefficients that characterize the elastic r...

В работе описывается алгоритм метода молекулярной (ланжевеновой) динамики, моделируемая система и основные параметры, характеризующие систему. Представленная математическая модель построена для магнитоактивной пылевой плазмы с учетом влияния силы трения, обусловленной наличием окружающей среды (буферной плазмы). Для решения уравнений движения пылев...

A numerical simulation method is used to investigate the optical and electrical properties of both conventional sandwich and quasi-interdigitated back-contact (QIBC) perovskite solar cells (PSCs). The results reveal the fundamental physics of PSCs with different architectures, exhibiting their difference in working principle and device properties....

Simulation of the thermal motion of ions in a spherical bunch was performed on the basis of the molecular dynamics. The Yukawa potential was used to describe the ion interactions. Obtained data showed good agreement with results of theoretical investigation. The conclusion was done that INURA accelerator needs good plasma neutralization in order to...

В данной работе представлены результаты исследования столкновительных свойств плотной квазиклассической плазмы на основе эффективных потенциалов взаимодействия, учитывающих квантовомеханический эффект дифракции и эффект динамической экранировки. Сделано сравнение с данными, полученными на основе статических потенциалов взаимодействия, сформулирован...

The phenomenon of electron runaway in a dense semiclassical plasma was investigated on the basis of the effective potentials of particle interactions. These effective potentials take into account the quantum-mechanical effect of diffraction and static or dynamic screening. The results of numerical calculations of the effective collision frequency,...

We investigate via molecular dynamics simulations the propagation of solitons in a two‐dimensional many‐body system characterized by Yukawa interaction potential. The solitons are created in an equilibrated system by the application of electric field pulses. Such pulses generate pairs of solitons, which are characterized by a positive and negative...

In this article the review of interaction potentials for compound particles (i.e. atoms, clusters etc.) ofcomplex plasmas that have been derived and developed by academician Fazylkhan Baimbetov and hisstudents over the past 25 years is given. Complex plasmas such us dense non-ideal plasmas, partiallyionized plasmas, dusty plasmas are considered. We...

In this paper, the process of electron capture in nonideal plasma has been investigated. For this goal the Bohr-Lindhard method has been applied to obtain the electron capture cross section. All calculations have been done in the framework of the trajectories of incident electron near hydrogen ion (proton) obtained by the numerical simulation of th...

In this paper, the ionization and recombination coefficients of dense semiclassical hydrogen plasma on the basis of the effective interaction potential have been investigated. For this goal the Bohr – Lindhard method and method phase function have been applied to obtain the electron capture and ionization cross sections. The electron capture cross...

We investigate via Molecular Dynamics simulations the propagation of solitons in a two-dimensional many-body system characterized by Yukawa interaction potential. The solitons are created in an equilibrated system by the application of electric field pulses. Such pulses generate pairs of solitons, which are characterized by a positive and negative...

В данной работе рассказывается о разработанном автоматизированном комплексе компьютерных программ по исследованию и моделированию физических свойств магнитоактивной плазмы. Компьютерное моделирование системы было проведено на основе молекулярной динамики с учетом влияния внешнего однородного магнитного поля. Частицы системы взаимодействую с помощью...

In this paper, the ionization and recombination coefficients of dense semiclassical hydrogen plasma on the basis of the effective interaction potential have been investigated. For this goal the Bohr$-$Lindhard method and method phase function have been applied to obtain the electron capture and ionization cross sections. The electron capture cross...

В данной работе приведены результаты численного вычисления радиуса электронного захвата в частично ионизованной плазме. В качестве взаимодействия электрона с атомом был выбран эффективный потенциал взаимодействия, который учитывает эффект экранировки на больших расстояниях и эффект дифракции на маленьких расстояниях. Получены результаты исследовани...

We investigate the dynamical conductivity of dense hydrogen plasmas on the basis of the effective interaction potential (taking into account static or dynamic screening and diffraction effects). We apply a generalized Drude–Lorentz formula related to the dynamical conductivity with collision frequency. The influence of electron–ion collisions as we...

The effect of an external magnetic field and gas‐induced friction on the velocity autocorrelation of the dust particles in strongly coupled two‐dimensional Yukawa liquids was investigated. The Langevin dynamics computer simulation method was used. The presence of the friction originating from the background gas leads to the disappearance of a colle...

The self-diffusion phenomenon in a two-dimensional dusty plasma at extremely strong (effective) magnetic fields is studied experimentally and by means of molecular dynamics simulations. In the experiment the high magnetic field is introduced by rotating the particle cloud and observing the particle trajectories in a corotating frame, which allows r...

В представленной работе получена модифицированная численная схема Верле. Данная схема предназначена для решения уравнений движения заряженных частиц, погруженных во внешнюю стационарную среду и однородное магнитное поле, для примера, заряженных частиц конденсированного вещества в буферной плазме (пылевая плазма). Влияние окружающей среды на динамик...

We investigate the simultaneous effect of a static homogeneous external magnetic field and a background gas medium on the quasi-localization of the dust particles – characterized quantitatively by cage correlation functions – in strongly coupled two-dimensional Yukawa systems. We apply the Langevin dynamics computer simulation method in which the f...

The self-diffusion phenomenon in a two-dimensional dusty plasma at extremely strong (effective) magnetic fields is studied experimentally and by means of molecular dynamics simulations. In the experiment the high magnetic field is introduced by rotating the particle cloud and observing the particle trajectories in a co-rotating frame, which allows...

New results on the dynamical conductivity and dynamical collision frequency of dense semiclassical hydrogen plasmas on the basis of the effective interaction potential (taking into account screening and diffraction effects) are presented. The electron density ne and temperature T vary in the domains 1021 cm−3<ne<1024 cm−3 and 104 K<T<106 K, corresp...

The results of the experiment on the formation of a cluster in a cusp magnetic trap under microgravity conditions and its destruction at a gradual increase of its electric potential are discussed. It is shown that if a cluster is formed by initially uncharged particles, then the auto‐adhesion forces exert an important influence on its shape, struct...

New results on the reflectivity and Brewster angle of dense xenon plasmas based on of the effective interaction potentials (which take into account static and dynamic screening effects) at pressures of 1.6–20 GPa and temperatures of ∼30,000 K are presented. Using Fresnel formulas, the reflectivity coefficients for the s- and p-polarized laser waves...

We investigate the simultaneous effect of a static homogeneous external magnetic field and a background gas medium on the quasi-localization of the dust particles -- characterized quantitatively by cage correlation functions -- in strongly coupled two-dimensional Yukawa systems. We apply the Langevin dynamics computer simulation method in which the...

We investigate the simultaneous effect of a static homogeneous external magnetic field and a background gas medium on the quasi-localization of the dust particles -- characterized quantitatively by cage correlation functions -- in strongly coupled two-dimensional Yukawa systems. We apply the Langevin dynamics computer simulation method in which the...

The method, which allows one to carry out computer simulation of a system of charged particles in a strong external homogeneous magnetic field with a time step that is independent on the Larmor oscillation time, was generalized for the case of the presence of the surrounding background for the moving particles. Correctly taking into account a stron...

The electron-atom interaction taking account of dynamic screening is considered in the dense partially ionized plasmas. The phase-function method is used. It is shown that the phase shifts and differential cross sections of the electron scattering on the helium and argon atoms, calculated taking account of dynamic screening, are bigger than those o...

A series of experiments on the modernized "Coulomb crystals" setup on board of the International Space Station (ISS) was performed. Formation of a cluster of charged and uncharged particles was observed. Excitation and damping of cluster oscillations, as well as its destruction in the high electric field were investigated. Charges of the particles...

The influence of an external homogeneous magnetic field on the quasilocalization of the particles—characterized quantitatively by cage correlation functions—in strongly coupled three-dimensional Yukawa systems is investigated via molecular dynamics computer simulations over a wide domain of the system parameters (coupling and screening strengths, a...

Within the dynamic screening potential model, elastic scattering processes between electrons and atoms in partially ionized plasmas were investigated using the method of phase functions. The phase shifts were calculated by solving the Calogero equation. Differential and total cross sections for the scattering of electrons on noble gas atoms were ca...

In this work, the process of electron capture in partially ionized plasma is considered. Electron-atom interaction was described by the effective interaction potential, which takes into account the screening effect at large distances and the diffraction effect at the small distances. The results of numerical calculations of the electron capture rad...

In strongly coupled plasmas the diffusion of the particles takes place on a timescale that is long compared to the timescale of oscillations of the particles in the local minima of the potential landscape. The ensuing quasi-stability of the local particle configurations can be quantified by monitoring the changes of the immediate surroundings, i.e....

No abstract is available for this article.

In this paper, the dielectric function of dense semiclassical collisionless plasmas is investigated on the basis of the interaction potential, which takes into account the effects of diffraction in a wide range of temperatures and densities. The dielectric function is analytically and numerically investigated in approximation of high frequencies. A...

Elastic scattering of electrons by hydrogen atoms in a dense semiclassical hydrogen plasma for low impact energies has been studied. Differential scattering cross sections were calculated within the effective model of electron-atom interaction taking into account the effect of screening as well as the quantum mechanical effect of diffraction. The c...

The elastic scattering processes of the charged particles in the dense nonideal plasma on the basis of the dynamic interaction potential were investigated. It is shown that dynamic charge screening increases the phase shifts and the scattering cross sections in comparison with static screening. The problem was solved on the basis of the Calogero eq...

In this work the dielectric function of the dense semiclassical collisionless plasmas was investigated on the basis of the interaction potential which takes into account the effects of diffraction in a wide range of temperatures and densities. The dielectric function was analytically and numerically investigated in approximation of high frequencies...

The pair interaction potential of charged particles in a dense two-component plasmas, which takes into account quantum-mechanical effects, was obtained on the basis of the comparison of the quantum-mechanical Slater sum with the classical Boltzmann factor. The equations issued from this comparison were solved numerically and the spline approximatio...

Spectral line shapes of neutral helium 3889 Å ( 2 3 S – 3 3 P ) transition line are calculated by using several theoretical methods. The electronic contribution to the line broadening is calculated from quantum statistical many-particle theory by using thermodynamic Green’s function, including dynamic screening of the electron-atom interaction. The...

We investigate the effect of an external magnetic field on the velocity autocorrelation function and the "caging" of the particles in a two-dimensional strongly coupled Yukawa liquid, via numerical simulations. The influence of the coupling strength on the position of the dominant peak in the frequency spectrum of the velocity autocorrelation funct...

This paper presents the results of the analysis of the experimentally measured width of the dust-free region around a single electric probe in a dusty plasma of glow discharge. The experimental results were compared with the data of a theoretical study on the basis of the balance equation of the dust particles thermal energy and their electrostatic...

The purpose of this work is an investigation of the diffusion coefficient of the dust component in complex plasma. The computer simulation of the Yukawa liquids was made on the basis of the Langevin equation, which takes into account the influence of buffer plasma on the dust particles dynamics. The Green-Kubo relation was used to calculate the dif...

In this paper we consider the behavior of the dust particles around the electric probe with a negative potential. The size of the dust-free region, which depends on the probe potential, was experimentally determined. Theoretical calculation of the size of the dust-free region based on the energy balance was performed. Comparison of theoretical esti...

The dynamic model of the charged particles interaction in non-ideal semiclassical plasma is presented. This model takes into account the quantum mechanical diffraction effect and the dynamic screening effect. On the basis of the dynamic interaction potential, the electron scattering cross sections are investigated. Comparison with the results obtai...

The velocity autocorrelation functions of dust particles were calculated by the Langevin dynamics. It was indicated that their oscillations decay more rapidly with increase in the friction parameters. The dependencies of the dust particles diffusion coefficient on the friction coefficient at the different values of various parameters were obtained...

In this work composition and thermodynamic properties of dense alkali metal plasmas (Li, Na) were investigated. Composition was derived by solving the Saha equations with corrections due to nonideality. The lowering of the ionization potentials was calculated on the basis of pseudopotentials by taking screening and quantum effects into account (© 2...

In this work the semiclassical potential for plasma particles pair interactions, which takes into account the diffraction effects due to the uncertainty principle in two-component plasma (the region of temperatures 104K < T < 108K and densities 1021cm–3 < n ≤ 1024cm–3), was proposed. The values of this potential were numerically calculated and an i...

In the present work the dynamics of dust particles near electric probe in gas discharge at different pressures was studied. Trajectories of dust particles near electric probe with taking into account of the ion drag force and neutral friction force were calculated numerically. The comparisons between experimental and calculated results showed the g...

In this work effective interaction potentials between different types of particles in complex plasmas are presented. In particular interactions between dust-dust, charge-atom and charge-charge in classical and semiclassical cases were considered. For the purpose of taking into account screening effects in interparticle interaction the method of die...

A new method for measuring of the dust particle charge in a glow discharge plasma is described. The inverse problem of the restoration of the particle charge on the basis of its videotaped trajectory around the electric probe was solved. The obtained results of dust parameters can be used for the development of new methods for dusty plasma diagnost...

In this work the interaction between macroparticles in dusty plasmas is considered. To take into account screening effects in interparticle interaction we use the method of dielectric response function. The grains are considered as dipoles due to the nonequilibrium effects in dusty plasma.

A new method for determination of macroparticle charge in dc glow discharge plasma is described. The inverse problem of the estimation of the particle's charge on the basis of its videotaped trajectory around the electric probe was solved. The effective interaction potentials in a complex dusty plasma are discussed.

This article discusses the effective interaction potentials in a complex dusty plasma. The interaction of electrons with atoms and the interaction between dusty particles are studied by the method of the dielectric response function. In the effective interaction, potential between electron and atom the quantum effects of diffraction were taken into...

In the present work we determine the ionization equilibrium of dense tungsten, aluminum and iron plasmas by solving the Saha equations with corrections due to non-ideality. The lowering of the ionization potentials is calculated on the basis of effective potentials by taking screening and quantum effects into account (© 2011 WILEY-VCH Verlag GmbH &...

Using the dielectric function method, the effective interaction potential between ions in a dense semiclassical plasma is investigated. For the case of a partially ionized strongly coupled plasma, the effective potential of charge-unperturbed atom interaction is presented. Both effective potentials are screened. To obtain these potentials the diele...

Interaction between dust particles in a plasma is investigated on the basis of experimental pair correlation functions of dust formation in a dc glow discharge and the Poisson equation. It is shown that the calculated effective potentials have an oscillating character and depend rather weakly on macroscopic parameters of the plasma. Existence of an...

Microscopic, thermodynamic and transport properties of complex plasmas are investigated on the basis of effective potentials of interparticle interaction. These potentials take into account correlation effects and quantum‐mechanical diffraction. Plasma composition, thermodynamic functions of hydrogen and helium plasmas are obtained for a wide regio...

The kinetic and thermodynamic properties of non-ideal Al and Cu plasmas were investigated on the basis of pseudopotential models, taking screening and quantum-mechanical effects into account. For investigation of ionization stages, the Saha equations with corrections to non-ideality (lowering of ionization potentials) were used.

In the present work, the behavior of dust particles near an attracting Langmuir cylindrical probe in glow discharge plasma was investigated experimentally. Trajectories of dust particles for different initial kinetic energies and impact parameters were analyzed numerically. The comparision between experimental and simulation results are made. The r...

Radial distribution functions of dusty plasma particles are calculated by the application of the Langevin dynamics to a system of particles interacting through the Yukawa potential. Proposed numerical model is first validated by the comparison of the numerical results with available experimental data. Both numerically determined and experimental ra...

The paper reports on the first experiments with plasma-dust formations in dc gas discharge plasma for a He-Ar mixture. It is shown that the choice of light and heavy gases for the mixture suppresses ion heating in electric field under the conventional conditions of experiments and results in a supersonic jet with high Mach numbers. Distribution fun...

The velocity autocorrelation functions and square displacements were calculated on the basis of experimental data obtained on experimental setup with dc discharge. Computer simulation of the system of dust particles by the method of the Langevin dynamics was performed. The comparisons of experimental and theoretical results are given.

The paper reports on the first experiments with plasma‐dust formations in dc gas discharge plasma for He‐Ar mixture. It is shown that under the conventional conditions of the experiments with dusty structures in plasma, the choice of light and heavy gases for the mixture suppresses electron heating in electric field and results in a supersonic jet...

The Poisson equation was numerically solved on the basis of the experimental correlation functions of dusty particles. Calculations were performed with real parameters of dusty plasma. Reconstructed potential has oscillated character; the minimums coincide to maximums of correlation functions.

This paper presents radial distribution functions of dust particles obtained experimentally in dc and rf discharges. Pressure and interaction energy of dusty particles were calculated on the basis of these functions. The Langevin dynamics computer simulation for each experiment was performed. The comparisons with computer simulations are made.

Shear viscosity of dusty plasma was calculated on the basis of the Langevin dynamics. Shear viscosity is considered as a function of many parameters and buffer plasma pressure is among them. Complicated dependence of viscosity on plasma pressure is considered. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

The influence of a highly pronounced non-equilibrium characteristic of the electron energy distribution function in a stratified dc glow discharge on the process of dust particle charging in a complex plasma is taken into account for the first time. The calculated particle charge spatial distribution is essentially non-homogeneous and it can explai...

The thermodynamic and transport properties of dense semiclassical plasmas were investigated on the basis of pseudopotential models taking into account quantum-mechanical effects at short distances and screening effects at large distances. The equation of state was calculated using correlation functions. The cross sections, the composition of the al...

Elastic cross sections of electrons on atoms were investigated in the framework of a pseudopotential interaction model. Within a partial wave expansion, the scattering phase shifts are determined, and total and differential cross sections were obtained. The bremsstrahlung cross section for electron collisions with neutral atoms is evaluated. (© 200...

Within the polarization model, elastic scattering processes between electrons and atoms in partially ionized plasmas are investigated using the method of phase functions. Total cross sections for the scattering of electrons on noble gas atoms were calculated and com- pared with experimental and other theoretical data.

The effective polarization interaction potential between charged and neutral particles is considered for a partially ionized plasma. This pseudopotential is deduced taking into account quantum-mechanical effects at short distances as well as screening effects at large distances. Furthermore, a cutoff radius is obtained using a modified effective-ra...

Microscopic and thermodynamic properties of dense semiclassical partially ionized hydrogen plasma were investigated on the basis of pseudopotential models. Radial distribution functions (RDF) of particles were obtained using a system of the Ornstein–Zernike integral equations. The corrections to internal energy and the equation of state were calcul...

Computer simulation of dusty plasma properties is performed. The radial distribution functions, the diffusion coefficient are calculated on the basis of the Langevin dynamics. A comparison with the experimental data is made.

Phase shifts, cross sections and transport coefficients of dense semiclassical plasma are investigated. It is shown that consideration of screening effects at large distances and quantum effects at short distances leads to a decrease in scattering probability, i.e., to an increase of the corresponding transport coefficients. The Calogero equation w...

Elastic cross sections of electrons on atoms were investigated in a framework of pseu- dopotential interaction model. The partial wave expansion scattering method was used. Total and differential cross sections were obtained. The bremsstrahlung cross section for electrons collision with neutral atoms is considered.

The pseudopotentials of particle interaction, taking into account quantum-mechanical effects of diffraction at short distances and also screening effects at large distances, are obtained for a partially ionized plasma. The dielectric function method was used.