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EUV-Induced Nanostructuring of Solids

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Bartnik A., Fiedorowicz H., Jarocki R., Kostecki J., Szczurek A., Szczurek M., Wachulak P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
445-449
EN
In this work results of investigations concerning nanostructuring of polymers and some other solids using a laser-plasma extreme ultraviolet source are presented. The plasma radiation was produced using a gas puff target and focused with a gold-plated grazing incidence ellipsoidal collector. Decomposition process of polymers was investigated using a quadrupole mass spectrometer. Different kinds of micro- and nanostructures created in near-surface layers of the materials were investigated using scanning electron microscope. Forms of the structures depend on a particular material and the extreme ultraviolet exposure. In case of some polymers even a single shot is sufficient for creation of the visible changes in surface morphology. In case of inorganic solids visible changes require usually the exposure with tens or hundreds of extreme ultraviolet pulses.
2
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Creation of Nanostructures on Polymer Surfaces Irradiated with Extreme Ultraviolet Pulses

100%
Bartnik A., Fiedorowicz H., Jarocki R., Kostecki J., Szczurek A., Szczurek M.
Acta Physica Polonica A
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2009
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vol. 116
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issue S
S-108-S-110
EN
A laser-plasma extreme ultraviolet source equipped with grazing incidence and Mo/Si collectors was used for surface modification of selected polymers. Surface morphology after irradiation was investigated. Different forms of nanostructures were obtained depending on polymer and irradiation conditions.
3
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Primary Radiolytic Reactions in the Auger Blob Formed by Radioactive Transformation of ^{57}Co into ^{57}Fe in Frozen Aqueous Medium

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Stepanov S., Perfil'ev Y., Byakov V., Kulikov L.
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vol. 125
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issue 3
843-845
EN
The emission of the Auger electrons during the formation of the Mössbauer nucleus ^{57}Fe leads not only to the formation of multicharged ^{57}Fe^{n+} ion, but also to the appearance of the Auger blob, a cloud of several hundreds of ion-electron pairs (H_2O^{+}, e¯) in the solvent around the Fe ion. Fast radiation-chemical reactions therein determine the experimentally observable ratio of the yields of final chemically stable charged states of the Mössbauer ions (Fe^{3+} and Fe^{2+}). This ratio strongly depends on reaction rates constants between H_2O^{+}, e¯, and the solute S. We have shown that in contrast to radiation chemical data the reactivity of NO_{3}^{-} anions with quasi-free track electrons in frozen aqueous solutions exceeds those of H_{3}O^{+}, ClO_{4}^{-}, and HSO_{4}^{-} ions only by a factor of three instead of ≈ 100 which follows from the radiation chemical experiments.
4
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Wavelet Analysis in EPR Spectroscopy

100%
Drzewiecki A., Sczaniecki P.
Acta Physica Polonica A
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2005
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vol. 108
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issue 1
73-79
EN
Possibility of application of wavelet analysis in EPR spectroscopy is investigated. Basic mathematics of the method is summarized, with emphasis on the relation between EPR experiment and physical interpretation of wavelet transform. The fact that first derivative of the Lorentzian function can be used as a base wavelet is employed and the specific rules of the interpretation of the final wavelet synthesis are identified. Analysis of a sample EPR spectrum of X-ray irradiated guanidinium aluminium sulphate hexahydrate crystal is given as an example. Set of parameters resulting from the wavelet analysis is subsequently used to reconstruct/synthesize the original EPR spectrum. The method involves an opportunity of eliminating unwanted components of the multicomponent spectra. Generally, the method may supplement other means of data analysis, in particular, in magnetic resonance.
5
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Micro- and Nanoprocessing of Polymers Using a Laser Plasma Extreme Ultraviolet Source

100%
Bartnik A., Fiedorowicz H., Jarocki R., Kostecki J., Rakowski R., Szczurek A., Szczurek M.
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issue 2
384-390
EN
Laser plasma with temperature of the order of tens eV can be an efficient source of extreme ultraviolet (EUV). The radiation can be focused using different kind of optics, giving sufficient fluence for some applications. In this work we present results of investigations concerning applications of a laser plasma EUV source based on a double stream gas puff target. The source was equipped with two different grazing incidence collectors. One of them was a multifoil collector, the second one was an axisymmetrical ellipsoidal collector. The multifoil mirror was used mainly in experiments concerning micromachining of organic polymers by direct photo-etching. The experiments were performed for different polymers that were irradiated through a fine metal grid as a contact mask. The smallest element of a pattern structure obtained in this way was 5 μm, while the structure height was 50 μm giving an aspect ratio about 10. The laser-plasma EUV source equipped with the axisymmetrical ellipsoidal collector was used for surface modification of organic polymers and inorganic solids. The surface morphology after irradiation was investigated. Different forms of micro- and nanostructures were obtained depending on material and irradiation conditions.
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