I. K. Gainullin

Formation of aluminum island films under electron irradiation of a sapphire surface

The present paper is devoted to experimental investigation of electron-stimulated desorption from a single-crystal sapphire surface. Using Auger electron spectroscopy metallization of the sapphire surface, the character of which is dependent on the electron beam parameters, is observed under low-energy electron bombardment,. Using atomic-force microscopy, images of metal island films with a diameter of 50–100 nm are obtained.

Quantum size effect during the electron exchange between a negative hydrogen ion and a cluster of aluminum atoms

This paper deals with the study of the process of electron exchange between a negative hydrogen ion and a cluster of aluminum atoms. The method of wave packet propagation not using perturbation theory is applied to solve the problem. It is shown that the quantum size effect exists during the electron exchange between a negative hydrogen ion and an atomic cluster.

Features of electron exchange under grazing scattering of negative hydrogen ions by a spherical cluster of aluminum atoms

The electron exchange under grazing scattering of a negative hydrogen ion by a spherical cluster of aluminum atoms is investigated. To solve the problem, the wave packet’s propagation method, which doesn’t utilize the perturbation theory, has been used. The fraction of scattered negative ions has been calculated as a function of the ion’s velocity component parallel to the surface. It is shown that the yield of negative hydrogen ions under grazing scattering by a spherical cluster has a bell-shaped dependence on the value of the velocity component parallel to the surface.

Electron charge transfer along quantum nanosystems

The charge exchange transfer between a negative hydrogen ion and carbon nanotube is considered. The electron transfer problem was solved by the Wave Propagation Packets (WPP) method, which does not involve the perturbation theory. Double walled nanotube and nanotube with defects of different parameters was under study.

Features of the electron exchange under grazing scattering of H − ions from a thin aluminum disk

The electron exchange under grazing scattering of a negative hydrogen ion from a thin Al disk is analyzed via the wave packet propagation method that does not use the perturbation theory. The probability of H− ion fraction formation is calculated as a function of the ion velocity component (v‖) parallel to the surface. It is shown that the yield of negative hydrogen ions has a bell-like dependence on the value of v‖ under grazing scattering from a thin disk. The negative ion yield under grazing scattering from a disk is very close to the H− ion yield under scattering from a film. The maximum of the probability of H− fraction formation calculated for a thin disk is shifted to smaller values of v‖ with respect to the maximum of the probability of H− formation for a thin film.

Influence of the Geometric Dimensions of a Nanosystem on the Main Characteristics of Charge Exchange with a Negative Ion

The problem of charge exchange between a negative hydrogen ion and nanosystems (thin metal films and island films) is considered. Quantum-mechanical calculations show that the effectiveness of charge exchange is determined by the ion-surface distance and the structure of discrete electron energy levels inside the film. In turn, the structure of the discrete levels depends on the film’s geometric dimensions. The characteristics of charge exchange (the effectiveness of the electron transfer, the probability of charge exchange, the propagation velocity, and the average coordinate of the electron’s position inside the film) are calculated via solution of the nonstationary Schrödinger equation. It is shown that these quantities can also be approximated by a simple linear model of electron propagation.

Slow ion scattering by crystal surfaces and nanostructures

This review is dedicated to considering issues of low-energy ion scattering by solid surfaces. In addition to general issues, original results obtained by researchers at the department of physical electronics (Faculty of Physics, Moscow State University) are considered. They have initiated new directions in the study of slow ion scattering. Attention is focused on experimental data and the results of computer simulation. The section dedicated to discussing the charge exchange between the scattered particles and the surface, and nanostructures is an important part of this review.

Electron capture in the collision of a proton with a hydrogen atom

Electron capture in the collision of a proton with a hydrogen atom is investigated. The probability of electron capture is calculated from first principles by the direct solving of the three-dimensional nonstationary Schrödinger equation. The dependence of the probability of electron capture by a proton on the proton’s velocity and impact parameter is obtained and analyzed thanks to highly efficient computations with the use of graphic processing units.

Quantum-hydrodynamic approach to the problem of electron exchange between atomic particles and nanosystems

The application of quantum-hydrodynamic methods for solving the problem of electron exchange between atomic particles and solid surfaces, and nanosystems has been examined. The derivation of a system of equations that is alternative to the nonstationary Schrödinger equation is given to describe the dynamics of electronic processes with variable charge and current densities. A comparison of results of solving the nonstationary Schrödinger equation and the quantum-hydrodynamic system of equations shows that both approaches give a good coincidence. The numerical solution to the system of quantum-hydrodynamic equations has a number of advantages, because it does not lead to oscillations at the boundary of the computational mesh and nor to the problem of exponential growth in numerical complexity for many-electron systems.

Peculiarities of electron exchange between a negative hydrogen ion and atomic chains

This paper is dedicated to studying electron exchange between a negative hydrogen ion and an atomic chain with subsequent electron transport along the linear chain of hydrogen atoms. This process occurs after the electron transition from the negative hydrogen atom to the atomic chain. In our calculations, a method of wave packet propagation not using perturbation theory was applied. It is shown that the effectiveness of electron transport decreases uniformly as the distance from the ion to the chain increases. The electron propagates along the chain uniformly; in this case, the electron velocity is almost independent of the ion-chain distance.