A. S. Sabirov

Study of the influence of polarization fields on the channeling of charged particles in nanotubes using the dielectric approach

The polarization potential of the interaction between polarized particles with walls propagating in a nanotube and the loss of energy spent on exciting the surface modes of electromagnetic oscillations are calculated. The nanotube is modeled as a cylindrical layer with a given dielectric function taking the time dispersion of the medium into account. It is noted that the produced polarization forces can, under certain conditions, considerably affect the character of the trajectories of the channeling particles.

Study of the influence of vacancies and atoms adsorbed into carbon nanotube walls on ion dechanneling using a computer simulation

Specific features of the channeling of ions and atomic particles in carbon nanotubes in the presence of vacancies on the tube walls and adsorbed atoms inside it are studied by means of computer simulation. The channeling parameters sensitive to the concentrations of vacancies and adsorbed atoms and their localizations are determined for the use of atomic beams in probing nanotubes.

Atomic particle channeling simulation in carbon nanotubes

The ion distributions of vibration and rotation energies, as well as of the degree of torsion at the nanotube outlet, have been calculated via mathematical simulation of molecular hydrogen ion channeling in a carbon nanotube. The observed resonance effects have been analyzed. It is found that the probability of ion detection increases near the axis of a chiral carbon nanotube.

Calculation of the energy losses of charged particles upon motion near a nanotube within dielectric formalism

A carbon nanotube has been simulated in the form of a cylindrical layer with a given dielectric function, taking into account the temporal dispersion of the medium. Quantization of the intrinsic electrical oscillations of a carbon nanotube electron subsystem has been performed. The polarization potential, which arises when a charged particle moves near a carbon nanotube, has been calculated and the energy loss caused by the excitation of surface plasmons has been obtained.

Studying surface vortices and potential fields in a conducting cylinder

The surface electromagnetic waves in a conducting cylinder are studied with allowance for the different polarization properties of a medium with respect to potential and vortex electromagnetic fields.

Nonregular phenomena in systems of quantum wells in the presence of tunneling processes

The effect of tunneling on inelastic processes in atomic collision physics has been studied using two examples: head-on collision between hydrogen atoms and protons and hydrogen-atom reflection from an impenetrable wall. These phenomena are analyzed using the numerical solution of the nonstationary Schrödinger equation.

Ion motion in a system of partially ordered nanotubes

Ion channeling in a system of partially ordered nanotubes is considered. According to the results of numerical analysis, the channeling effect should be clearly observable for protons at energies of several hundred eV.

Generation of surface plasmons in a conductor by moving charges

The surface polarization fields generated by a charge moving near a sphere or cylinder have been considered. This problem is related to the phenomena arising in an arc discharge in a gas near a solid surface during the formation of conducting cylindrical or spherical nanostructures, in particular, carbon nanotubes or fullerenes. The polarization fields, forces, energy losses, and other characteristics have been calculated.

Polarization-Field Influence on Light-Ion Channeling in Carbon Nanotubes

The polarization potential of the interaction between fast charged particles and multilayer-nanotube walls, which arises due to the excitation of surface modes of electromagnetic oscillations, is estimated. A nanotube is interpreted as a set of concentric cylindrical layers with specified dielectric properties. Formulas for calculating the polarization-field potential are derived as applied to a charged particle moving parallel to the multilayer nanotube axis. Numerical calculations are performed in the single-mode approximation of a dielectric function. The polarization forces arising in a multilayer nanotube are compared with those corresponding to the single-layer one. It is demonstrated that, under certain conditions, existing external layers can sufficiently affect the polarization forces acting on charged-particle channeling in a nanotube. At the same time, model calculations indicate that outer layers exert an insignificant influence on the polarization losses of the channeling-particle energy.

Role of vacancies and adsorbed atoms in the channeling of molecular particles in CNTs

The channeling of atomic and molecular particles in carbon nanotubes is considered in the presence of vacancies on the walls and of adsorbed atoms inside them. It is shown that the significant influence of the indicated disturbance of nanotube structures greatly affects channeling, which makes it possible to use beams of atomic and molecular particles to probe nanotubes.