排序方式: 共有22条查询结果,搜索用时 15 毫秒
1.
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
2.
L. Dargel-Sulir E. Jarocki A. Kozlowski M. Michalik 《Journal of Thermal Analysis and Calorimetry》1990,36(4):1281-1283
The compositional dependence of the DTA curves was analyzed for FexCo78–xSi9B13 metallic glasses. The crystallization temperature were determined. The results suggest that the thermal stability rises with increasing iron content.
Zusammenfassung An metallischen GlÄsern FexCo78–xSi9B13 wurde die AbhÄngigkeit der DTA-Kurven von der Zusammenfassung untersucht. Den Ergebnissen nach steigt die thermische StabilitÄt mit wachsendem Eisengehalt.相似文献
3.
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
4.
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
5.
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
6.
H. Fiedorowicz A. Bartnik R. Jarocki R. Rakowski M. Szczurek 《Applied physics. B, Lasers and optics》2000,70(2):305-308
X-ray emission from a double-stream gas puff target irradiated with a nanosecond Nd:glass laser pulse was studied for the
first time. The target was formed by pulsed injection of a high-density gas into a gas cloud by using the double-nozzle setup.
This new concept allows a high-density gaseous target to be formed at a relatively large distance from the nozzle output.
Enhanced X-ray emission in the 1-keV energy range and a smaller source size were observed as compared to the ordinary gas
puff target created by pulsed injection of gas into vacuum. This new approach should be useful in the development of a laser-produced
X-ray source for various applications.
Received: 20 October 1999 / Published online: 27 January 2000 相似文献
7.
Przemyslaw W. Wachulak Andrzej Bartnik Marcin Skorupka Jerzy Kostecki Roman Jarocki Mirosław Szczurek Lukasz Wegrzynski Tomasz Fok Henryk Fiedorowicz 《Applied physics. B, Lasers and optics》2013,111(2):239-247
We report on a compact, desktop size, laboratory type microscopy setup, based on a short wavelength gas puff target soft X-ray source, which emits incoherent radiation in “water-window” spectral range. The microscope employs a Wolter type I reflective objective and allows capturing magnified images of objects with ~1-μm spatial resolution and exposure time as low as 5 s. A detailed characterization and optimization of both the source and the microscope setups are presented and discussed. 相似文献
8.
Zenon Łotowski Joanna Piechowska Łukasz Jarocki 《Monatshefte für Chemie / Chemical Monthly》2008,139(3):213-222
Summary. Two new dimeric cholaphanes with oxamide spacers were prepared. The spacers bind two identical steroidal subunits through
positions 3,3′ and 24,24′ (head-to-head dimer) or positions 3,24′ and 3′,24 (head-to-tail dimer). 相似文献
9.
10.
A. Bartnik H. Fiedorowicz R. Jarocki J. Kostecki M. Szczurek A. Biliński O. Chernyayeva J. W. Sobczak 《Applied Physics A: Materials Science & Processing》2010,99(4):831-836
Extreme ultraviolet (EUV) radiation is the electromagnetic radiation ranging from vacuum ultraviolet to soft X-rays. A single
EUV photon carries enough energy to ionize any atom or molecule. The penetration depth of the radiation in any material is
very short, ranging from tens to hundreds nanometers. Intense EUV pulses can remove material from the surface or modify its
morphology or/and chemical structure. In this work, the radiation from a laser-plasma EUV source based on a double-stream
gas-puff target was used for surface modification of polyethylene terephthalate (PET). The PET samples were irradiated with
the EUV pulses emitted from krypton plasma and focused with a gold-plated ellipsoidal collector. The spectrum of the focused
radiation covered the wavelength range from 9 to 70 nm. The PET samples were irradiated for 1 s–2 min at a 10-Hz repetition
rate. Surface morphology of polymer samples after irradiation was investigated using a scanning electron microscope. Changes
in chemical surface structure of the irradiated samples were investigated using an X-ray photoelectron spectroscopy. Different
kinds of surface microstructures were obtained depending on the EUV fluence in a single pulse and the total EUV fluence. XPS
measurements also revealed a modification of the chemical structure. 相似文献