排序方式: 共有42条查询结果,搜索用时 31 毫秒
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A. Bartnik H. Fiedorowicz R. Jarocki L. Juha J. Kostecki R. Rakowski M. Szczurek 《Applied physics. B, Lasers and optics》2006,82(4):529-532
The first results of experiments on direct photo-etching of heated PTFE using a 10 Hz X-ray source based on a laser-irradiated gas puff target are presented. X-ray radiation in the wavelength range from 6 to 20 nm was produced as a result of irradiation of a double-stream gas puff target with Nd:YAG laser pulses of energy 0.8 J and time duration 3 ns. The resulting X-ray pulses with energy of about 100–200 mJ were used to irradiate samples of PTFE to create microstructures by direct photo-etching. Strong enhancement of the photo-etching process was observed for samples heated up to 300 °C. PACS 52.38.Ph; 81.65.Cf; 61.82.Pv 相似文献
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R. Rakowski J. Miko?ajczyk A. Bartnik H. Fiedorowicz F. de Gaufridy de Dortan R. Jarocki J. Kostecki M. Szczurek P. Wachulak 《Applied physics. B, Lasers and optics》2011,102(3):559-567
In this paper a new approach to a laser-produced plasma EUV source based on a tin target is presented. A?thin layer of pure tin and composite layers consisting of Sn with Si, SiO and LiF are investigated. The target composed of several thin layers produces less debris than the other targets and provides a conversion efficiency (CE) in the 13.5-nm±1% band at least comparable to the CE for the pure tin slab target. The largest CE was observed for the target composed of a mixture of Sn and LiF, due to the fact that lithium, similarly to tin, is a strong emitter at 13.5?nm. 相似文献
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Babankova D Civis S Juha L Bittner M Cihelka J Pfeifer M Skala J Bartnik A Fiedorowicz H Mikolajczyk J Ryć L Sedivcova T 《The journal of physical chemistry. A》2006,110(44):12113-12120
Large-scale plasma was created in molecular gases (CO, CO2, N2, H2O) and their mixtures by high-power laser-induced dielectric breakdown (LIDB). Compositions of the mixtures used are those suggested for the early earth's atmosphere of neutral and/or mildly reducing character. Time-integrated optical spectra emitted from the laser spark have been measured and analyzed. The spectra of the plasma generated in the CO-containing mixtures are dominated by emission of both C2 and CN radicals. A vibrational temperature of approximately 10(4) K was determined according to an intensity distribution in a vibronic structure of the CN (B2Sigma(+)u-X2Sigma(+)g) violet band. For comparison, the NH3-CH4-H2-H2O mixture has been irradiated as a model of the strongly reducing version of the early earth's atmosphere. In this mixture, excited CN seems to be significantly less abundant than C2. The LIDB experiments were in the molecular gases carried out not only in the static cell but also using a large, double stream pulse jet (gas puff target) placed in the vacuum interaction chamber. The obtained soft X-ray emission spectra indicate the presence of highly charged atomic ions in the hot core of high-power laser sparks. 相似文献
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P. W. Wachulak Ł. Węgrzyński Z. Zápražný A. Bartnik T. Fok R. Jarocki J. Kostecki M. Szczurek D. Korytár H. Fiedorowicz 《Applied physics. B, Lasers and optics》2014,117(1):253-263
A volume, tomographic reconstruction of a novel, multi-jet gas puff target, developed for possible applications in high-order harmonic generation (HHG), is presented. The target, produced by pulsed injection of argon gas through nozzle in a form of linearly oriented small orifices, has been characterized in the extreme ultraviolet at 13.5 nm wavelength. Target density estimations were performed, and 3-D representation of pulsed gaseous target has been obtained by combining 2-D shadowgram images, recorded at various rotation angles. More detailed information about higher-order jets, formed as a result of collisions of primary jets, was obtained. Tomographic studies of such type of targets dedicated for HHG have been obtained to our knowledge for the first time. 相似文献
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Przemyslaw W. Wachulak Andrzej Bartnik Henryk Fiedorowicz Dalibor Pánek Petr Br??a 《Applied physics. B, Lasers and optics》2012,109(1):105-111
Laser-produced plasma sources of short-wavelength radiation offer an interesting alternative to synchrotron and free-electron laser installations. Recently, we reported on a newly developed desktop EUV microscope based on plasma generated from a gas-puff target and diffractive optics. The half-pitch resolution of the microscope approached 50?nm. Compared to analogous microscopes based on synchrotron sources, our system is compact and cost-effective. In this paper, we present the results of imaging experiments on a thin polycrystalline object that was carried out in order to further examine the applicability of the microscope. We have demonstrated here that EUV microscopy can provide structural information that cannot be accessed by conventional optical microscopy or SEM. 相似文献
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A. Bartnik H. Fiedorowicz R. Jarocki J. Kostecki M. Szczurek P. W. Wachulak 《Applied Physics A: Materials Science & Processing》2012,106(3):551-555
In this paper an efficient micromachining of poly(vinylidene fluoride) (PVDF) by direct photo-etching with a laser-plasma
EUV (extreme ultraviolet) source was demonstrated for the first time. Mass spectroscopy was employed to investigate the ablation
products and revealed emission of numerous molecular species of C-containing fragments of the polymer chain. Chemical surface
changes after irradiation were investigated using X-ray photoelectron spectroscopy (XPS). The XPS spectra obtained for PVDF
samples, irradiated with low and high EUV fluence, indicate significant differences between chemical structures in near-surface
layers. It was shown that irradiation with low fluence results in defluorination and thus carbon enrichment of the polymer
in near-surface layer. In contrary, irradiation with high fluence leads to intense material ablation and hardly modifies the
chemical structure of the remaining material. 相似文献
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Maciej Fiedorowicz Jean Remy Galindo Michel Julliard Patrice Mannoni Michel Chanon 《Photochemistry and photobiology》1993,58(3):356-361
Abstract— Photodynamic induced cytotoxicity by Victoria blue BO (VB-BO), merocyanine 540 (MC540), Nile blue A (NB) and 4-tetrasulfonatophenyl-porphyrin (4-TSPP) has been studied on two human leukemic cell lines: K-562 and TF-1. Cells were incubated with dyes and irradiated with different doses of white light. Cell survival was assessed by propidium iodide (PI) staining using flow cytometry analysis. Concentrations of 5 x 10 8 M VB-BO were found to kill 75% of cells, and a concentration of 1 × 10−7 M induced more than 99% of cell killing. To obtain the same cytotoxic level, the presence of 2.6 × 10−5 M of MCS40 during irradiation was needed. Under the conditions used, NB was ineflective as a photosensitizer, although uptake studies showed that this dye was taken by the cells in much greater amounts than any other studied dye. Cell cycle distribution of TF-1 cells, surviving MC540 or VB-BO photoscnsitization has bccn studied by flow cytometry analysis after staining with Hoechst 33342 and PI. It was found that cells in G1 phase were slightly more resistant toward MCS40– and VB-BO-mediated photosensitization than cells in other phascs of the ccll cycle 相似文献