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Viktor Kanicky Vitezslav Otruba J.-M. Mermet 《Fresenius' Journal of Analytical Chemistry》1999,363(4):339-346
A simple device was designed to measure the acoustic signal accompanying laser ablation. The potential use of this signal
for laser ablation-inductively coupled plasma atomic emission was examined. A frequency quadrupled pulsed Nd:YAG laser radiation
was used for the ablation of glass, steel and ceramic samples. The relation between the acoustic signal, the laser energy,
the analyte signal and the amount of ablated material was studied and evidence of the use of the acoustic signal for the exact
focusing of the laser beam onto the sample surface was given. A more intense acoustic signal was observed for the exact focusing
with a formation of larger ablation craters in glass and ceramics.
Received: 25 June 1998 / Revised: 25 September 1998 / Accepted: 30 September 1998 相似文献
2.
Viktor Kanicky Vitezslav Otruba J.-M. Mermet 《Analytical and bioanalytical chemistry》1999,363(4):339-346
A simple device was designed to measure the acoustic signal accompanying laser ablation. The potential use of this signal for laser ablation-inductively coupled plasma atomic emission was examined. A frequency quadrupled pulsed Nd:YAG laser radiation was used for the ablation of glass, steel and ceramic samples. The relation between the acoustic signal, the laser energy, the analyte signal and the amount of ablated material was studied and evidence of the use of the acoustic signal for the exact focusing of the laser beam onto the sample surface was given. A more intense acoustic signal was observed for the exact focusing with a formation of larger ablation craters in glass and ceramics. 相似文献
3.
Federico Moretti Anna Vedda Norberto Chiodini Mauro Fasoli Alessandro Lauria Vitezslav Jary Romana Kucerkova Eva Mihokova Angeloclaudio Nale Martin Nikl 《Journal of luminescence》2012,132(2):461-466
Structural and optical properties of sol–gel silica based glassceramics doped with 0.1 mol% Ce and codoped with Gd at high concentrations, from 5 mol% up to 40 mol%, are investigated and compared to those of analogous samples doped only with Ce. Raman scattering, transmission electron microscopy, and x-ray diffraction reveal the formation of Gd apatite-like silicate (Gd4.67O(SiO4)3) and of Gd pyrosilicate (Gd2Si2O7) nanophases whose morphology and crystallinity depend on the Gd concentration and thermal treatments. Optical absorption measurements demonstrate the role of the densification atmosphere in modifying the charge state of Ce ions. The incorporation of Ce3+ ions in the nanophases is put in evidence by photo- and radio-luminescence results. 相似文献
4.
V. Stranak H. Wulff R. Bogdanowicz S. Drache Z. Hubicka M. Cada M. Tichy R. Hippler 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,64(2-3):427-435
Properties of different methods of magnetron sputtering (dc-MS, dual-MS and dual-HiPIMS) are studied and compared with respect to intermetallic Ti-Cu film formation. The quality and features of thin films are strongly influenced by the energy of incoming particles. The ion velocity distribution functions (IVDFs) were measured by time-resolved retarding field analyzer (RFA) in the substrate position. Thin films were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD) and X-ray reflectometry (XR). Properties and crystallography of Ti-Cu films are discussed as a function of ion energy which is affected by the mode of sputtering. It was found that IVDFs measured in pulsed discharges exhibit double-peak distribution. The IVDFs reach the maximum at ion energies about ~8 eV. The ion saturated current is highest in dual-HiPIMS discharge (~5 μA/cm2) and is mostly represented by Cu+ and Ar+ ions. The mode of sputtering influences chemical composition and film formation. The copper forms polycrystalline fcc-phase while much smaller Ti particles enwraps the copper crystallites or are part of a solid solution. 相似文献
5.
Linda Zaoralkova Ales Hrdlicka Vitezslav Otruba Petr Sulovsky Nicole Gilon Detlef Günther Viktor Kanicky 《Chemical Papers》2011,65(6):769-781
The applicability of laser ablation (LA) inductively coupled plasma (ICP) spectrometry for assessing elemental distributions
in layered ceramics was investigated and compared with electron probe microanalysis (EPMA). Ordinary glazed wall tiles were
employed as model specimens due to their defined structure and composition. They were used for calibration in the analysis
of ancient pottery. A qualitative depth profile was acquired by single-spot laser drilling perpendicular to coatings with
a Nd:YAG (1064 nm) laser coupled with an ICP optical emission spectrometer (OES). The lower lateral resolution associated
with the laser spot diameter of 1.0 mm led to smoothing of the depth profile due to the averaging of local irregularities.
In addition, transverse line scans by ablation across the tile section using an ArF* (193 nm) laser coupled with an ICP mass
spectrometer (MS) were performed. LA-ICP-OES depth profiles and LA-ICP-MS transverse scans were validated by EPMA section
scans and 2D back-scattered electrons images. The LA-ICP-OES acquisition was less dependent on sample surface and layer irregularities,
whereas the transverse line scan over the tile section with the small-spot beam offered insight into the micromorphology of
the individual layer. The combined approach revealed the occurrence of individual mineral grains, micro-heterogeneities and
the character of interfaces between layers. 相似文献
6.
Purine and pyrimidine nucleotides influence many metabolic pathways and their analogs have been widely used in medicine. A capillary electrophoretic method was developed for measuring intracellular nucleotides. The final BGE consisted of 40 mM citric acid with addition of 0.8 mM CTAB titrated by gamma-aminobutyric acid to pH 4.4. The electrophoretic separations were carried out in an uncoated silica capillary (id/od - 75/375 microm; effective/total length - 90/97 cm). The method allows a complete separation of 21 nucleotides and deoxynucleotides within 15 min with separation efficiencies up to 400,000 theoretical plates per meter. Due to the use of an acidic separation medium, the method offers a high selectivity toward the studied analytes versus possible interferences from matrices. Sample preparation was optimized in order to shorten work-time and prevent analyte degradation. The method was applied for analyzing nucleotides in human erythrocytes and Chinese hamster ovary cells. Diagnostic potential for inherited metabolic disorders of nucleotide metabolism is presented. 相似文献
7.
Mateusz
mietana Pawe Niedziakowski Wioleta Biaobrzeska Dariusz Burnat Petr Sezemsky Marcin Koba Vitezslav Stranak Katarzyna Siuzdak Tadeusz Ossowski Robert Bogdanowicz 《Electroanalysis》2019,31(2):398-404
In this work an optical fiber sensor, where a lossy‐mode resonance (LMR) effect was obtained due to indium tin oxide (ITO) thin overlay, has been simultaneously applied as a working electrode in a 3‐electrode cyclic voltammetry electrochemical setup. Since LMR conditions highly depend on refractive index of a surrounding medium, an LMR‐based sensor was applied for optical investigations of electrolyte's properties at the ITO surface. We have found that the optical response of the sensor highly depends on the applied potential and its changes, as well as the properties of the investigated electrolyte, i. e., its composition and presence of a redox probe. Both optical and electrochemical response of the ITO‐LMR sensor to various concentrations of phosphate‐buffered saline (PBS), NaCl and Na2SO4, as well as scan rate were investigated and discussed. We have found that the responses in optical and electrical domains differ significantly and may deliver supplementary information about the investigated analyte. 相似文献
8.
The presented work is aimed at the development of nontoxic nanocrystalline silicon fluorescence labels, biodegradable in living
body and long-term stable, and of fluorescent nanodiamonds mainly for in vitro use. These novel fluorescence labels could
be very good substitutes for commercially used quantum dots (e.g. cadmium compound quantum dots) which can be toxic according
to the latest results. In this work, manufacturing of porous nanocrystalline silicon (por-Si) is described, several basic
optical properties of por-Si are presented and the influence of Si nanocrystals, nanodiamonds, and milled silicon on the growth
of a cell culture of L929 mouse fibroblast and HeLa cells is compared. Bio-interaction of nanoparticles was studied by optical
transmission microscopy, time-lapse microphotography of cell culture evolution, fluorescence microscopy, fluorescence microspectroscopy,
and scanning electron microscopy. The size and shape of nanocrystals were determined using atomic force microscopy (AFM). 相似文献
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