A5045450894- Laser-induced spectroscopy and plasma
- ZnO doping and properties
- Analytical chemistry methods development
- Thin-Film Transistor Technologies
- Atomic and Molecular Physics
- Gas Sensing Nanomaterials and Sensors
- Luminescence Properties of Advanced Materials
- Copper-based nanomaterials and applications
- Silicon Nanostructures and Photoluminescence
- Force Microscopy Techniques and Applications
- Laser-Matter Interactions and Applications
- Adhesion, Friction, and Surface Interactions
- 2D Materials and Applications
- Ion-surface interactions and analysis
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Advanced Semiconductor Detectors and Materials
- Cultural Heritage Materials Analysis
- Advanced Sensor and Energy Harvesting Materials
- Nanowire Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Laser Material Processing Techniques
- Chalcogenide Semiconductor Thin Films
- Ga2O3 and related materials
- Mercury impact and mitigation studies
University of Latvia
2014-2024
Latvian Biomedical Research and Study Centre
2003
The provision of a particle and power exhaust solution which is compatible with first-wall components edge-plasma conditions key area present-day fusion research mandatory for successful operation ITER DEMO. work package plasma-facing (WP PFC) within the European programme complements laboratory experiments, i.e. in linear plasma devices, electron ion beam loading facilities, studies performed toroidally confined magnetic such as JET, ASDEX Upgrade, WEST etc. connection both groups done via...
Abstract Laser-induced breakdown spectroscopy (LIBS) is one of the most promising methods for quantitative in-situ determination fuel retention in plasma-facing components (PFCs) magnetically confined fusion devices like ITER and JET. In this article, current state understanding LIBS development applications will be presented, based on a complete review existing results complemented with newly obtained data. The work has been performed as part research programme, set up EUROfusion...
The surface plays an exceptionally important role in nanoscale materials, exerting a strong influence on their properties. Consequently, even very thin coating can greatly improve the optoelectronic properties of nanostructures by modifying light absorption and spatial distribution charge carriers. To use these advantages, 1D/1D heterostructures ZnO/WS2 core/shell nanowires with a-few-layers-thick WS2 shell were fabricated. These thoroughly characterized scanning transmission electron...
Abstract Background Sperm DNA integrity is of paramount importance in the prognosis fertility. We applied image cytometry to a toluidine blue (TB) test we recently proposed. Methods samples from 33 men were assayed for standard sperm parameters and classified as normal or abnormal. smears subjected TB test, denaturation testing with acridine orange (AO), terminal deoxyuridine triphosphate biotin nick end labeling (TUNEL). In CCD analysis, TB‐stained cell heads microscopically assigned one...
We demonstrate the generation of high-order harmonics laser pulses in palladium and cadmium plasmas. adjusted wavelength driving to investigate resonance enhancement different ranges extreme ultraviolet region. The summation incommensurate waves during two-color pump Pd Cd plasmas allowed a broader range harmonics. theoretical aspects laser-induced plasma are discussed.
In this work polyhedron-like gold and sphere-like silver nanoparticles (NPs) were manipulated on an oxidized Si substrate to study the dependence of static friction contact area particle geometry. Measurements performed inside a scanning electron microscope (SEM) that was equipped with high-precision XYZ-nanomanipulator. To register occurring forces quartz tuning fork (QTF) glued sharp probe used. Contact areas calculated by using different models compared experimentally measured force. The...
ITER plans foresee the quantitative diagnostics of fuel retention in reactor walls at near-atmospheric pressures. Using laser induced breakdown spectroscopy (LIBS) for this purpose assumes a reliable resolving Balmer α-lines hydrogen isotopes spectra plasma produced by focused radiation onto target surface. To develop LIBS during maintenance breaks ITER, effect background gas pressure on laser-induced characteristics has been studied. The limits expansion rate and as result it leads to...
Core–shell nanowires are an interesting and perspective class of radially heterostructured nanomaterials where epitaxial growth the shell can be realized even at noticeable core–shell lattice mismatch. In this study hexagonally shaped consisting WS2 nanolayers was grown on {11̅00} facets prismatic wurtzite-structured [0001]-oriented ZnO for first time. A synthesis performed by annealing in a sulfur atmosphere ZnO/WO3 structures, produced reactive dc magnetron sputtering amorphous a-WO3 layer...
Optical and luminescence properties of Y3Al5O12 (YAG) single crystals preliminary irradiated by swift heavy ions were studied. Swift Xe with fluences ranging from 6·1010 to 2·1012 ions/cm2 utilized for the irradiation nominally undoped YAG crystals. A stable strong induced absorption observed in 200–600 nm spectral range correlates fluence. It is suggested that several centers are responsible this their possible origin (F-type centers) proposed discussed. The strongly modifies YAG, namely,...
ITER foresees applying laser induced breakdown spectroscopy (LIBS) as a tool for quantitative assessment of fuel retention in the first walls. One open problem related to LIBS application is choice type. Here we compare two Nd/YAG lasers with different pulse durations, 0.15 and 8 ns, working at λ = 1064 nm studies samples D-doped W/Al coatings ≈ 3 μm thickness (Al used proxy Be) on Mo. Low pressure argon was background gas. Experiments were done conditions where other factors (broadening...
Crystalline wurtzite zinc oxide (w-ZnO) can be used as a wide bandgap semiconductor for light emitting devices and transparent or high temperature electronics. The use of amorphous (a-ZnO) an advantage in these applications. In this paper, we report on x-ray a-ZnOx thin films (∼500 nm) deposited at cryogenic temperatures by reactive magnetron sputtering. substrates were cooled nitrogen flow through the copper substrate holder during deposition. characterized diffraction, Raman, infrared,...
Amorphous Si thin films deposited on oxidized crystalline surface (111) were crystallized by thermal annealing and nanosecond green laser pulses. The Raman scattering spectra show that can provide nearly fully poly-Si film. Laser crystallization of amorphous is more flexible method, but it difficult to reach high levels crystallinity. Depth studies treated samples reveal a amorphous-like interlayer between substrate
In this paper, metal nanodumbbells (NDs) formed by laser-induced melting of Ag nanowires (NWs) on an oxidized silicon substrate and their tribological properties are investigated. The mechanism ND formation is proposed illustrated with finite element method simulations. Tribological measurements consist in controllable real-time manipulation NDs inside a scanning electron microscope (SEM) simultaneous force registration. geometry enables to distinguish between different types motion, i.e....
Laser Induced Breakdown Spectroscopy (LIBS) method is considered for assessing the retention of hydrogen isotopes in ITER plasma-facing components during maintenance breaks when reactor filled with near atmospheric pressure nitrogen or inert gas. At these conditions, broadening spectral lines and reduction line intensities complicates distinguishing isotopes. The aim present study was to investigate effect nitrogen, argon helium ambient gas on spatio-temporal distribution LIBS plasma plume...
In this study, we characterize the properties of indium and tin laser-induced plasmas responsible for efficient high-order harmonics generation ultrashort pulses propagating through these media. The optimally formed plasma was determined using analysis time-resolved variations in spectral morphological features spreading components under different regimes laser ablation. We report measurements velocities ablation correlate them with optimal delay between heating probe highest yield. Electron...
Colloidal suspensions of CdS, PbS, Cu2S, Ag2S and ZnO nanocrystals were prepared by chemical route in presence organic capping ligands. The formation was studied using UV-visible absorption spectroscopy. Kelvin probe measurements work function performed on thin film ITO (indium tin oxide) coated glass.
Nanomanipulation experiments were carried out on nanodumbbells (NDs) to study their kinetic behavior and tribological properties. Ag, Au Cu NDs produced by laser-induced melting of corresponding nanowires (NWs). characterized transmission electron microscopy (TEM) scanning (SEM). Manipulation performed first with atomic force microscope (AFM) at ambient conditions, then inside SEM high vacuum conditions. Different regimes motion observed. In-plane out-of-substrate-plane rotation identified...