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Příprava vzorků pro kalibraci zvětšení elektronových mikroskopů / 2016
Olejník, Kamil
2016 - Czech
Zabývali jsme se litografickou přípravou vzorků používaných pro kalibraci zvětšení elektronových mikroskopů.We have been working on lithographical preparation of specimens used for magnification calibration of electron microscopes. We have been working on lithographical preparation of specimens used for magnification calibration of electron microscopes.\n
Keywords:
electron microscope calibration; electron-beam lithography
Available at various institutes of the ASCR
Příprava vzorků pro kalibraci zvětšení elektronových mikroskopů / 2016
Zabývali jsme se litografickou přípravou vzorků používaných pro kalibraci zvětšení elektronových mikroskopů.We have been working on lithographical preparation of specimens used for magnification ...
Laser-driven ablation through fast electrons in PALS experiment
Gus'kov, S. Yu.; Chodukowski, T.; Demchenko, N.; Kalinowska, Z.; Kasperczuk, A.; Krouský, Eduard; Pfeifer, Miroslav; Pisarczyk, P.; Pisarczyk, T.; Renner, Oldřich; Skála, Jiří; Šmíd, Michal; Ullschmied, Jiří
2016 - English
Energy transfer to shock wave in Al and Cu targets irradiated by a laser pulse with intensity of I~1-50 PW/cm2 and duration of 250 ps was investigated at Prague Asterix Laser System (PALS). The iodine laser provided energy in the range of 100-600 J at the first and third harmonic frequencies. The focal spot radius of laser beam on the target was varied from 160 to 40 µm. The dominant contribution of fast electron energy transfer into the ablation process was found when using the first harmonic radiation, the focal spot radius of 40-100 µm, and the energy of 300-600 J. The fast electron heating results in the growth of ablation pressure from 60 Mbar at the intensity of 10 PW/cm2 to 180 Mbar at the intensity of 50 PW/cm2 and in the growth of the efficiency of the energy conversion into the shock wave from 2 to 7 % under the conditions of 2D ablation.
Keywords:
laser-produced plasma; ablation pressure
Available at various institutes of the ASCR
Laser-driven ablation through fast electrons in PALS experiment
Energy transfer to shock wave in Al and Cu targets irradiated by a laser pulse with intensity of I~1-50 PW/cm2 and duration of 250 ps was investigated at Prague Asterix Laser System (PALS). The iodine ...
Aproximace Fourierových koeficientů difrakčních profilů
Čerňanský, Marian
2016 - Czech
Je podán stručný přehled aproximací, které se vyskytují ve Warrenově–Averbachově interpretaci Fourierových koeficientů difrakčních profilů. Je ukázáno, že jisté aproximace průběhu Fourierových koeficientů umožňují stanovit velikost krystalitů a mikrodeformací jen z jedné difrakční linie.\n\n Approximations in the Warren-Averbach interpretation of Fourier coeeficients of diffraction profiles are briefly summarized. It is shown, that certain approximations of a course of Fourier coefficients enable estimate of crystallite size and microstrain only from a single diffraction line.
Keywords:
line profile analysis; Fourier coefficients; crystallite size; microstrain
Available at various institutes of the ASCR
Aproximace Fourierových koeficientů difrakčních profilů
Je podán stručný přehled aproximací, které se vyskytují ve Warrenově–Averbachově interpretaci Fourierových koeficientů difrakčních profilů. Je ukázáno, že jisté aproximace průběhu Fourierových ...
Micro-Raman analysis of samples irradiated at the FLASH facility in Summer 2014 (Report v1-31_05_2016)
Toufarová, Martina; Hájková, Věra; Chalupský, Jaromír; Juha, Libor
2016 - English
The goal of micro-Raman measurements was to indicate a presence of the carbon black grown in the FEL-illuminated areas on the sample surface. Twelve samples have been investigated and results have been reported to the X-ray Optics Group at the University of Twente.
Keywords:
radiation damage; carbon black; free-electron laser; soft x-rays; Raman spectroscopy
Available at various institutes of the ASCR
Micro-Raman analysis of samples irradiated at the FLASH facility in Summer 2014 (Report v1-31_05_2016)
The goal of micro-Raman measurements was to indicate a presence of the carbon black grown in the FEL-illuminated areas on the sample surface. Twelve samples have been investigated and results have ...
Geometric resonances in reflectivity spectra of lead zirconate
Dočekalová, Zuzana; Hlinka, Jiří
2016 - English
The paper deals with effects of domain boundaries on the THz–frequency range dispersion of the complex dielectric permitivity tensor of lead zirconate. In the case of a sufficiently narrow domain widths (in comparison to the wave–length of the light used in the experiment), the effective–medium average permittivity shows additional peaks identified as geometric resonances, i.e. extraneous excitations created by thematerial interface. Features of the far–infrared reflectivity spectra of the twinned lead zirconate crystal in the limit of narrow and wide domains are estimated with the\nhelp of the damped harmonic oscillator model with paramaters fully determined fromrecent experiments.
Keywords:
geometric resonances; lead zirconate; antiferroelectrics; reflectivity; phonon
Available at various institutes of the ASCR
Geometric resonances in reflectivity spectra of lead zirconate
The paper deals with effects of domain boundaries on the THz–frequency range dispersion of the complex dielectric permitivity tensor of lead zirconate. In the case of a sufficiently narrow domain ...
Book of Abstracts of the 26th Joint Seminar Development of Materials Science in Research and Education
Kožíšek, Zdeněk; Král, Robert; Zemenová, Petra
2016 - English
Topics:\n- Trends in development of materials research\n- Education of materials science at the universities\n- Information about the research programmes of individual institutions\n- Information on equipment for preparation and characterisation of materials\n- Results of materials science research
Keywords:
material sciences
Available at various institutes of the ASCR
Book of Abstracts of the 26th Joint Seminar Development of Materials Science in Research and Education
Topics:\n- Trends in development of materials research\n- Education of materials science at the universities\n- Information about the research programmes of individual institutions\n- Information on ...
Cryogenic cooling system Brayton for 10 J/10 Hz Yb:YAG multi-slab based laser system at ELI-Beamlines project
Schustr, P.; Fibrich, Martin; Polan, Jiří; Rus, Bedřich; Dostálová, M.; Valdislav, P.; Simek, J.
2016 - English
We present design and operational prototype of cryogenic cooling system based on Bryton's cycle for 10J/10Hz Yb:YAG multi-slab laser system at ELI-Beamlines project.
Keywords:
Brayton; cryogenics; laser; cooling; ytterbium; design; prototype
Available at various institutes of the ASCR
Cryogenic cooling system Brayton for 10 J/10 Hz Yb:YAG multi-slab based laser system at ELI-Beamlines project
We present design and operational prototype of cryogenic cooling system based on Bryton's cycle for 10J/10Hz Yb:YAG multi-slab laser system at ELI-Beamlines project.
Plazmatická příprava kovových a oxidových vrstev na keramické a plastové substráty.
Olejníček, Jiří
2016 - Czech
Smluvní výzkum byl zaměřen na přípravu a optimalizaci procesu plazmatické depozice vybraných tenkých vrstev kovů a polovodivých oxidů s požadovanými optickými vlastnostmi. Cílem bylo připravit průhledné barevné electrochromické vrstvy na teplotně citlivé substráty, vrstvy s vysokým indexem lomu na lisované plastové struktury a lesklé kovové vrstvy na porézní keramické masky.\n Contract research was focused on preparation and optimization of the plasma deposition process of selected thin metal and semiconducting oxide layers with required optical properties. The goal was to prepare transparent color electrochromic films on thermally sensitive substrates, the layers with high refractive index on the surface of pressed plastic structures and shiny metallic films on the porous ceramic masks.\n
Keywords:
magnetron sputtering; thin films; surface properties
Available at various institutes of the ASCR
Plazmatická příprava kovových a oxidových vrstev na keramické a plastové substráty.
Smluvní výzkum byl zaměřen na přípravu a optimalizaci procesu plazmatické depozice vybraných tenkých vrstev kovů a polovodivých oxidů s požadovanými optickými vlastnostmi. Cílem bylo připravit ...
Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains
Čermák, Jan; Yamada, T.; Ganzerová, Kristína; Rezek, Bohuslav
2015 - English
We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on all the grains. Yet intensity of Raman 2D band is grain-dependent: highest at the darkest grain and lowest at the brightest one. Contrary, conductive atomic force microscopy detects the highest conductivity at the brightest grain and the lowest current at the darkest grain. This is attributed to dominant electrical current path through graphene and underlying oxide thickness of which also depends on the type of copper grain. We correlate and discuss the results with view to better understanding of graphene growth and electronic properties on large area copper substrates.
Keywords:
graphene; chemical vapor deposition; atomic force microscopy; Raman spectroscopy; electronic properties
Available at various institutes of the ASCR
Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains
We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on ...
Magnetic domains under mechanical stress in single crystal Ni-Mn-Ga
Kopecký, Vít; Heczko, Oleg
2015 - English
The complexity of Ni-Mn-Ga single crystal lies in combination of ferromagnetic domain structure and ferroelastic twinned microstructure. Magnetic domain structure for different twinned microstructure was studied using magneto-optical indicator film. Different orientations of magnetic domains can be observed at the same place of the sample thanks to magnetically induced structural reorientation by movement of twin boundaries. We investigated experimentally the changes of magnetic domain structure in the vicinity of mobile a/c twin boundary.
Keywords:
Ni-Mn-Ga; magnetic domains; twin boundary
Available at various institutes of the ASCR
Magnetic domains under mechanical stress in single crystal Ni-Mn-Ga
The complexity of Ni-Mn-Ga single crystal lies in combination of ferromagnetic domain structure and ferroelastic twinned microstructure. Magnetic domain structure for different twinned ...
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