A5046175410- Ion-surface interactions and analysis
- Integrated Circuits and Semiconductor Failure Analysis
- Electron and X-Ray Spectroscopy Techniques
- Nuclear materials and radiation effects
- Semiconductor materials and devices
- Nuclear Materials and Properties
- Nanopore and Nanochannel Transport Studies
- Graphene research and applications
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Mass Spectrometry Techniques and Applications
- Radioactive element chemistry and processing
- Diamond and Carbon-based Materials Research
- Crystallography and Radiation Phenomena
- Advanced Condensed Matter Physics
- Nuclear physics research studies
- Force Microscopy Techniques and Applications
- Fusion materials and technologies
- Laser-induced spectroscopy and plasma
- Astro and Planetary Science
- Microstructure and mechanical properties
- Electronic and Structural Properties of Oxides
- Polymer Nanocomposite Synthesis and Irradiation
- Gamma-ray bursts and supernovae
Joint Institute for Nuclear Research
2015-2024
National Nuclear Center of the Republic of Kazakhstan
2018-2024
Institute for Nuclear Research
2024
L. N. Gumilyov Eurasian National University
2018-2019
Since a few breakthroughs in the fundamental understanding of effects swift heavy ions (SHI) decelerating electronic stopping regime matter have been achieved last decade, it motivated us to review state-of-the-art approaches modeling SHI effects. The track kinetics occurs via several well-separated stages: from attoseconds ion-impact ionization depositing energy target, femtoseconds electron transport and hole cascades, picoseconds lattice excitation response, nanoseconds atomic relaxation,...
The event-by-event Monte Carlo model, TREKIS, was developed to describe the excitation of electron subsystems various solids by a penetrating swift heavy ion (SHI), spatial spreading generated fast electrons, and secondary hole cascades. Complex dielectric function formalism is used obtain relevant cross sections. This allows recognition fundamental effects resulting from collective response subsystem target for that not possible within binary collision approximation these sections, e.g....
Response of dielectric crystals: MgO, Al2O3 and Y3Al5O12 (YAG) to irradiation with 167 MeV Xe ions decelerating in the electronic stopping regime is studied. Comprehensive simulations demonstrated that despite similar ion energy losses initial excitation kinetics systems lattices, significant differences occur among final structures tracks these materials, supported by experiments. No appeared whereas discontinuous distorted crystalline ~2 nm diameter were observed continuous amorphous...
We present a concurrent Monte Carlo (MC) - molecular dynamics (MD) approach to modeling of matter response excitation its electronic system. The two methods are combined on-the-fly at each time step in one code, TREKIS-4. MC model describes arrival irradiation, which the current implementation can consist photon, an electron, or fast ion. It also traces induced cascades secondary particles, electrons and holes, their energy exchange with atoms due scattering. excited atomic system is...
Porous architectures based on graphene oxide with precisely tailored nm-sized pores are attractive for biofluidic applications such as molecular sieving, DNA sequencing, and recognition-based sensing. However, the existing pore fabrication methods complex, suffer from insufficient control over density uniformity, or not scalable to large areas. Notably, creating vertical in multilayer films appears be particularly difficult. Here, we show that uniform 6-7 holes straight, nanochannels can...
Structure changes and their formation threshold in swift heavy ion (SHI) tracks Al2O3 are studied using a combined start-to-end numerical model. The hybrid approach consists of the Monte-Carlo code TREKIS, describing kinetics electronic subsystem, classical Molecular Dynamics for lattice atoms. developed is free from posteriori fitting parameters. Simulations Xe 167 MeV impacts show that relaxation an excess energy results cylindrical discontinuous disordered region about 2 nm diameter....
Near-surface nanoscale thermal conductivity (k) variation of ion-irradiated single-crystalline ZnO was studied by time-domain thermoreflectance. irradiated 710 MeV Bi swift heavy ions (SHI) in the 1010-1013 ion/cm2 fluence range to investigate progression radiation damage both from single ion impacts and path overlapping regimes. Structural characterization using X-ray diffraction, Raman spectroscopy, transmission electron microscopy indicated absence amorphization. The degradation k...
We present a multiscale model describing wet chemical etching of swift heavy ion tracks in olivine on the atomic scale. The approach combines Monte Carlo code TREKIS and molecular dynamics for simulations excitation structure transformations material after an impact. Analysis obtained positions proximity trajectory allows us to build up algorithm atom-by-atom removal from surface. describes primary highly damaged cylindrical track core followed by dissociation peripheral region formation...
Extending the fabrication methodology of solid-state nanopores in a wide range materials is significant fields single molecule detection, nanofluidic devices, and nanofiltration membranes. Here, we demonstrate new method to directly fabricate size- density-controllable sub-10 nm WO3 nanosheets using swift heavy ions (SHIs) without any chemical etching process. By selecting different electronic energy losses (Se), with sizes from 1.8 7.4 can be created nanosheets. The creation efficiency...
We found experimentally and theoretically that MgO, CaF2, Y3Al5O12 (YAG) irradiated with fast ions demonstrate a noticeably different surface response. Striking differences follow from the kinetics of nanodroplets ejection. Protrusion hot materials subsequent recrystallization in MgO CaF2 recover transient damage region, forming spherically shaped nanohillock. YAG demonstrated almost no recovery disorder, an amorphous hillock. These are attributed to complex interplay between mobilities...
The presented Monte Carlo model simulates excitation of the electron subsystem semiconductors by a penetrating swift heavy ion (SHI). cross sections interaction an with target are calculated via complex dielectric function formalism, which accounts for all collective modes ensemble target. predicted inelastic mean free paths in very good agreement those from NIST database. SHI energy losses coincide well SRIM and CasP codes. is used to calculate spectra electrons emitted germanium silicon...