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    Wyświetlanie 1-14 z 14
    Tytuł:
    A Method for the Spectroscopic Diagnostic of the Peculiarities of Materials Using the Semi-Auger Effect
    Autorzy:
    Tancic, A.
    Kutin, M.
    Davidovic, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808068.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.80.Wr
    Opis:
    We investigated the low energy satellites in the Röntgen spectra using the many-particle theory. These satellites are results of the radiative semi-Auger decay of the inner vacancy states. We did not treat only ordinary radiative decay. There exist the excitations of one of the atomic electrons together with the photon emission. We presented results of radiative semi-Auger decays of vacancy states in Ar atom. The knowledge of these processes is important for understanding the same processes in the case of the nanoparticles (molecules, fullerenes, clusters). Research in the field of the new materials requires more sophisticating methods which will open the new possibilities for obtaining materials of particular design, too. The theory which is presented in the paper may be easily generalized in case of particles like fullerenes and clusters.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 838-841
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Lasers, Operation and Applications
    Autorzy:
    Fiedorowicz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964129.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.60.By
    32.30.Rj
    Opis:
    X-ray lasers are currently being studied in many laboratories around the world. This paper gives a short description of X-ray laser physics, presents the parameters of existing X-ray lasers and their applications. Research aimed at developing an efficient X-ray laser acceptable to potential users is presented in the final part of the paper.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 945-951
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of Coster-Kronig enhancement factors of the some elements in the atomic number range 50 ≤ Z ≤ 59
    Autorzy:
    Yilmaz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058825.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.50.+d
    32.30.-r
    Opis:
    L X-ray fluorescence cross-sections of some elements in the atomic number range 50 ≤ Z ≤ 59 have been calculated theoretically according to subshell excitation energies of elements. The Coster-Kronig transitions (f₁₂, f₂₃, and f₁₃) are non-radiative transitions. The Coster-Kronig enhancement factors due to the effect of the Coster-Kronig transitions on L X-ray fluorescence cross-sections have been calculated theoretically. The calculated values have been compared with other earlier experimental and theoretical values.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1269-1272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of L Shell X-Ray Production and Average L Shell Fluorescence Yields for Some Heavy Elements at 123.6 keV
    Autorzy:
    Apaydin, G.
    Aylikçi, V.
    Kaya, N.
    Cengiz, E.
    Tiraşoğlu, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812352.pdf
    Data publikacji:
    2008-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.50.+d
    32.80.Fb
    Opis:
    The $L_{3l},$ $L_{3α},$ $L_{3β},$ $L_{2β},$ $L_{2γ},$ $L_{2η},$ $L_{1β}$ and $L_{1γ}$ X-ray production cross-sections and L shell average fluorescence yields were measured for the elements from Re to U using excitation energy of 123.6 keV. Measurements were performed using an $\text{}^{57}Co$ annular radioactive source and a Si(Li) detector. The theoretical values of the cross-sections were calculated using theoretically tabulated values of subshell photoionization cross-sections;the Coster-Kronig transition probabilities were based on the Dirac-Hartree-Slater theory and radiative emission rates. Experimental results were compared with the theoretically calculated values of L shell X-ray cross-sections. The present experimental results are in agreement with theoretical values.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 6; 1629-1638
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relative intensities of the 3d-2p lines emitted by Ar¹³⁺ ions after impact excitation by an electron beam
    Autorzy:
    Rachedi, S.
    Inal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068589.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.70.Fw
    52.20.Fs
    Opis:
    The intensity ratio R of the dipole-allowed lines 3d²D_{3/2,5/2} → 2p²P_{3/2} and 3d²D_{3/2} → 2p²P_{1/2} emitted from highly charged boron-like Ar¹³⁺ ion collisionally excited by a monoenergetic electron beam has been theoretically studied versus electron densities from 10⁹ to 5× 10¹³ cm^{-3}. The calculations were performed at different angles θ of observation with respect to the electron beam direction and various incident-electron energies e_{ı} from 0.65 to 3 keV. By taking into account all important transitions among 290 magnetic sublevels of the 2s²2p, 2s2p², 2p³, 2s²3l, 2s2p3l, 2p²3l (l = 0-2) configurations, a collisional-radiative model has been used for determining the populations of the upper magnetic sublevels of the lines. All required atomic data were computed with the Flexible Atomic Code. We find that the effect of anisotropy in the photon emission, due to the directionality of the incident electron beam, can lead to very significant differences between R(0°) and R(90°). Our results also indicate that the contribution from the ²D_{3/2}→ ²P_{3/2} line which blends with the ²D_{5/2} → ²P_{3/2} line enhances the effect of anisotropy.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 128-129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of the Atomic Structure for Fe XVII Lines
    Autorzy:
    Zhou, Chao
    Cao, Jian-Jian
    Liang, Liang
    Yu, Geng-Hua
    Wang, Zhan-Min
    He, Hua-Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/1398915.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.70.Cs
    34.80.Dp
    Opis:
    Energy levels, line strengths, oscillator strengths, radiative decay rates and fine structure collision strengths are presented for sixteen-times ionized iron (Fe XVII). The atomic data are calculated with the AUTOSTRUCTURE code, where relativistic corrections are introduced according to the Breit-Pauli distorted wave approach. The calculations of atomic data for 89 fine-structure levels generated from eleven configurations 2s²2p⁶, 2s²2p⁵ (3s, 3p, 3d), 2s²2p⁵ (4s, 4p, 4d, 4f) and 2s¹2p⁶ (3s, 3p, 3d) of the Ne-like Fe ion are presented. Fine structure collision strengths for transitions from the ground and the first four excited levels are presented at four electron energies: 75, 125, 175, and 250 Ry. These atomic structure data are compared with the available experimental and theoretical results.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1109-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $K_{β}//K_{α}$ X-Ray Intensity Ratios for Co, Ni, Cu, and~Zn in Phthalocyanines Complexes
    Autorzy:
    Baltas, H.
    Ertugral, B.
    Kantar, C.
    Sasmaz, S.
    Yılmaz, E.
    Cevik, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504553.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.80.-t
    31.70.-f
    Opis:
    The $K_{β} // K_{α}$ X-ray intensity ratios of Co, Ni, Cu and Zn in metalophthalocyanines complexes have been studied. Co, Ni, Cu and Zn elements have been excited by using 59.5 keV photons emitted by 50 mCi $\text{}^{241}Am$ radioactive source. K X-rays emitted by samples have been counted by a Si(Li) detector with resolution 0.16 keV at 5.9 keV. We have found that $K_{β} // K_{α}$ X-ray intensity ratios of Co, Ni, Zn, and Cu complexes have changed depending on chemical structures of Co, Ni, Zn and Cu. The measured values have been compared with the theoretical predictions and experimental values of pure elements.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 764-768
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on Zinc Selenide and Copper Selenide Thin Films Produced by Chemical Bath Deposition
    Autorzy:
    Durdu, B.
    Alver, U.
    Kucukonder, A.
    Söğüt, Ö.
    Kavgacı, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399499.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    78.70.En
    32.30.-r
    32.80.Fb
    Opis:
    The zinc selenide and copper selenide thin films were deposited by chemical deposition technique on glass substrates. For both films, sodium selenosulphate was used as a selenide ion source in an alkaline solution. The X-ray diffraction patterns show that the ZnSe has a cubic structure and $ Cu_3Se_2 $ film has a tetragonal structure. The relative intensity $ K_β / K_α $ of zinc and copper selenide thin films has been measured by using a $ \text{}^{241}Am$ radioisotope source (75 mCi). The obtained results were compared with the theoretical values.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 41-45
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of the change of the characteristic X-rays of the zinc in fluorine- and boron-doped ZnO thin films
    Autorzy:
    Söğüt, Ö.
    Kerli, S.
    Cengiz, E.
    Apaydın, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050909.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    78.70.En
    32.30.-r
    32.80.Fb
    Opis:
    In this study, K_{β}/K_{α} X-ray intensity ratios of zinc in pure zinc, undoped ZnO thin film and boron and fluorine-doped ZnO thin films have been investigated. These samples have been excited by 59.5 keV γ-rays from a ^{241}Am annular radioactive source. K X-rays emitted by the samples have been counted using an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. The K_{β}/K_{α} X-ray intensity ratios of the doped ZnO thin films have been compared with that of the undoped ZnO thin film. The deviations between the results can be explained by delocalization and/or charge transfer phenomena causing change in valence electronic configuration of zinc.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1124-1128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomedical Applications of Synchrotron X-Ray Fluorescence
    Autorzy:
    Kwiatek, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931695.pdf
    Data publikacji:
    1994-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.+n
    87.59.-e
    32.30.Rj
    Opis:
    Since the exact role of trace elements in living organisms is still not very well known, it is a need of a careful analysis and study on trace element distributions in various biomedical materials. The conventional techniques such as X-ray fluorescence, proton-induced X-ray emission, atomic absorption spectrophotometry do not always give precise determination, especially in microstructures areas. Since synchrotron radiation is very powerful and gives the opportunity to work with micro-beams the synchrotron radiation induced X-ray emission technique has been recently developed. Due to many properties of synchrotron radiation it becomes a very useful tool in science. In this paper a characterization of different apparatus for a trace element analysis as well as several applications are described to show the usefulness of the synchrotron radiation induced X-ray emission.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 5; 695-703
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Fluorescence Techniques in Medical Applications: Reference Values of Elements in Human Serum, Urine and Hair
    Autorzy:
    Majewska, U.
    Banaś, D.
    Braziewicz, J.
    Kubala-Kukuś, A.
    Pajek, M.
    Sychowska, I.
    Wudarczyk-Moćko, J.
    Antczak, G.
    Borkowska, B.
    Góźdź, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197643.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    87.64.kd
    87.64.kv
    Opis:
    The aim of undertaken long-term studies of the elemental composition of human serum, urine, and hair is to define reference values of elements concentration. For this purpose the total reflection X-ray fluorescence method was applied to determination of several elements concentration in human serum, urine and hair (S, K, Ca, Fe, Cu, Zn, Br, P, Cr, and Rb in serum samples; Fe, Cu, Zn, Rb, Cr, Mn, and Sr in urine samples; S, K, Ca, Fe, Cu, Br, Zn, Cl, Ti, Cr, Mn, Ni, and Se in hair samples) in the range of concentration from ppb to several hundred ppm. The method of selection of the control group, the experimental setup and its calibration procedure are described. We also present sample preparation methods and procedure of measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 864-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray Diffraction and Elemental Analysis of Medical and Environmental Samples
    Autorzy:
    Bielecka, K.
    Kurtek, W.
    Banaś, D.
    Kubala-Kukuś, A.
    Braziewicz, J.
    Majewska, U.
    Pajek, M.
    Wudarczyk-Moćko, J.
    Stabrawa, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197663.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.En
    87.64.Bx
    32.30.Rj
    87.64.kv
    Opis:
    The results of the elemental and chemical composition analysis of human medical samples (blood, serum, hair, urine, tooth, kidney stones, gallstones) and environmental samples (slag, cereal, vegetables, flour, pork bones, pork meat, fish) are presented. The analysis were performed by application of the total reflection X-ray fluorescence, wavelength dispersive X-ray fluorescence and X-ray powder diffraction methods. With X-ray fluorescence methods the following elements were identified: O, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, Se, Br, Rb, Sr, Zr, I, Ba, and Pb, whose concentrations were from a few ng/g to tens of percent. For some samples the elemental analysis was extended by X-ray powder diffraction measurements. With this method the chemical composition was determined. In the paper the experimental setups, methodology of samples preparation and methods of carrying out the measurements are described. As an example the X-ray spectra registered for gallstone sample are discussed in detail. Finally, the results of X-ray diffraction and elemental analysis for selected medical and environmental samples are summarized.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 911-918
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examples for the Industrial Use of Synchrotron Radiation
    Autorzy:
    Hormes, J.
    Chauvistré, R.
    Schmitt, W.
    Pantelouris, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920823.pdf
    Data publikacji:
    1992-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.+n
    29.20.-c
    32.30.Rj
    78.70.Dm
    Opis:
    Synchrotron radiation has become a valuable tool for many fields of basic research. Several of the methods which were here developed are also suitable for solving industrial problems. Perhaps the most promising ones are the various X-ray techniques, e.g. X-ray absorption spectroscopy (EXAFS and XANES) and X-ray fluorescence. In the following article the theoretical and experimental basis for these techniques is shortly introduced and some instructive examples for such applications for actual industrial problems are dicussed. In the last section, X-ray lithography for the production of microstructures is presented as an example where synchrotron radiation is already today used for industrial production.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 1; 37-50
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Route to Prepare Magnetic Material $Co_3V_2O_8$ and Structural Characterization
    Autorzy:
    Celik, G.
    Kurtulus, F.
    Guler, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491310.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.-m
    32.30.Rj
    33.20.Ea
    61.43.Gt
    61.66.Fn
    65.40.-b
    75.47.Lx
    81.40.Gh
    82.33.Pt
    84.40.-x
    Opis:
    $Co_3V_2O_8$ is a member of kagomé staircase oxides, represented by general formula $M_3V_2O_8$ (M = Ni, Co, Mn). It attracted great attention due to strong magnetic anisotropy, magnetic phase transition, genuine macroscopic quantum effects, strong quantum fluctuations, low-temperature ferroelectricity, field-induced magnetic transitions, complicated phase diagram and displays long-range magnetic order because of geometrical frustration. Different routes to prepare the frustrated magnetic material was reported such as floating zone technique and conventional high temperature method. $Co_3V_2O_8$ (International Centre for Diffraction Data (ICDD): 16-675) was synthesized with $Co_3O_4$ (ICDD: 80-1536) as binary phase by microwave assisted preparation using $Co(NO_3)_2 ·6H_2O$ and $NH_4VO_3$. The synthesized material was characterization by powder X-ray diffraction, the Fourier transform infrared spectroscopy, and thermogravimetric-differential thermal analysis.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 203-204
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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