Dielectronic recombination cross sections for the Li-like ions ${\mathrm{B}}^{2+}$ and ${\mathrm{C}}^{3+}$ via $1{s}^{2}2s\ensuremath{\rightarrow}1{s}^{2}2p$ excitation are reported. The amount of electron capture attending passage megaelectronvolt/(atomic mass unit) ion beams through a collinear, magnetically confined, space-charge-limited beam is observed as function relative energy. results agree well with distorted-wave calculations.

We investigate the influence of dynamic polarization carbon valence electrons on angular distributions protons channeled through short $(11,9)$ single-wall nanotubes at speeds 3 and $5\phantom{\rule{0.3em}{0ex}}\mathrm{a}.\mathrm{u}.$ (corresponding to proton energies 0.223 $0.621\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$), with nanotube length varied from 0.1 $0.3\phantom{\rule{0.3em}{0ex}}\mathrm{\ensuremath{\mu}}\mathrm{m}$. The image force is calculated by means a two-dimensional...

The theory of crystal rainbows is presented. It enables the generation and full explanation angular distribution ions transmitted through thin crystals. generated by computer simulation method. Then, rainbow lines in scattering angle plane are determined. These ensure distribution. applied to transmission ${\mathrm{Ne}}^{10+}$ a 〈100〉 Si crystal. ion energy 60 MeV thickness varied from 105 632 atomic layers, i.e., beginning first cycle second cycle.

Using the theory of crystal rainbows, we prove that well-known doughnut patterns observed in ion channeling thin membranes are manifestations rainbow effect. This is done by a detailed morphological study high-resolution experimental angular distributions 2 MeV protons channeled 55-nm-thick (001) silicon tilted away from [001] direction. The inner side dark rainbow, analogous to Alexander's band, occurring between primary and secondary meteorological rainbows.

The rainbow effect in ion channeling (in very thin crystals) is considered. In the analysis results of catastrophe theory are used. calculations were performed for 10-MeV ${\mathrm{H}}^{+}$ ions and 〈100〉 channel a 1000-A\r{}-thick Au crystal.

The best level of ordering and straightening carbon nanotube arrays is often achieved when they are grown in a dielectric matrix, so such structures present the most suitable candidates for future channeling experiments with nanotubes. Consequently, we investigate here how dynamic polarization valence electrons presence various surrounding media affects angular distributions protons channeled through (11,9) single-wall Proton speeds between 3 10 a.u., corresponding to energies 0.223 2.49...

We investigate the angular and spatial distributions of protons with an energy 0.223 MeV after channeling them through (11, 9) single-wall carbon nanotube 0.2 μm length. The proton incident angle is varied between 0 10 mrad, being close to critical for channeling. show that, as increases approaches channeling, a ring-like structure developed in distribution—the donut effect. demonstrate that it rainbow If zero half image force affects considerably number positions maxima distributions....

This is a theoretical study of transmission positrons kinetic energies 1 and 10 MeV through very short $(11,9)$ single-wall carbon nanotubes lengths 200 560 nm, respectively. The needed continuum interaction potential the positron nanotube obtained starting from Moli\`ere's approximation Thomas-Fermi atom. We calculate classical quantum angular distributions transmitted positrons. In calculations, approach via equations motion, in time-dependent Schr\"odinger equation solved. solutions these...

Here we report the results of theoretical investigation transmission channeled positrons through various short chiral single walled carbon nanotubes (SWCNT). The main question answered by this study is “What are manifestations rainbow effect in channeling quantum particles that happens during classical particles?” To answer question, corresponding and problems were solved parallel, critically examined, compared with each other. Positron energies taken to be 1 MeV when approach was necessary....

The crystal-blocking technique was used to measure the deexcitation times of evaporation residues 120-MeV $^{16}\mathrm{O}$ on $^{12}\mathrm{C}$, emerging along $〈110〉$ axis a 12-\ensuremath{\mu}m-thick diamond crystal. extracted ranged from 4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$ sec for Mg 4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}18}$ N, and they are consistent with statistical-model predictions.

We investigate how dynamic polarization of carbon valence electrons influences both the angular and spatial distributions protons channeled in a (11, 9) single-wall nanotube placed vacuum different dielectric media. Proton speeds between 3 10 a.u., corresponding to energies 0.223 2.49 MeV, are chosen with length varied 0.1 1 μm. In all performed calculations we describe interaction proton atoms on wall using Doyle-Turner potential. The image force is calculated two-dimensional hydrodynamic...

We investigate how the dynamic polarization of carbon atom valence electrons affects spatial distributions protons channeled in (11, 9) single-wall nanotubes placed vacuum and embedded various dielectric media. The initial proton speed is varied between 3 8 a.u., corresponding to energies 0.223 1.59 MeV, respectively, while nanotube length 0.1 0.8 µm. are generated using a computer simulation method, which includes numerical solving equations motion transverse plane. show that effect can...

In this work we analyze the superfocusing of protons channeled in a $\ensuremath{\langle}100\ensuremath{\rangle}$ Si thin crystal using theory rainbows. The initial proton energy is 68 MeV and beam incident angle increased gradually from zero up to 30$%$ critical for channeling. reduced thickness varied around 0.250, corresponding being 481.8 nm. spatial distributions protons, obtained by numerical solution equations motion transverse position plane Monte Carlo computer simulation code, are...

This book contains a thorough theoretical consideration of the process proton channeling through carbon nanotubes. We begin with very brief summary and experimental results studying ion Then, is described briefly. After that, crystal rainbow effect introduced. describe how it was discovered, present theory rainbows, as proper in crystals continue description zero-degree focusing protons channeled It shown that evolution angular distribution nanotube length can be divided cycles defined by...