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    Wyświetlanie 1-7 z 7
    Tytuł:
    Oxygen and Silicon K-EXAFS in SiO$\text{}_{2}$
    Autorzy:
    Nietubyć, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931716.pdf
    Data publikacji:
    1994-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Wg
    78.70.Dm
    Opis:
    The aim of this work was to calculate EXAFS (extended X-ray absorption fine structure) profile of the constituent elements for SiO$\text{}_{2}$ in β-quartz and in its amorphous form within a single scattering curved waves approximation. This method extends the EXAFS analysis to lower energies than the plane wave approximation. We have used wave functions for free ions and Pendry's procedure for central atom phase shifts calculation. Our results for Si K-EXAFS were consistent with experiment, whereas a significant deviation from experimental results for O K-EXAFS was observed. Similar EXAFS profiles for β-quartz and amorphous SiO$\text{}_{2}$ were obtained from calculations.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 5; 741-748
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO$\text{}_{2}$
    Autorzy:
    Sobczak, E.
    Nietubyć, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932134.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    79.20.Kz
    Opis:
    X-ray bremsstrahlung isochromat of amorphous SiO$\text{}_{2}$ deposited on Si crystal was measured in an energy range up to 250 eV above the threshold. Extended X-ray bremsstrahlung isochromat he structure (EXBIFS) was observed up to 150 eV for SiO$\text{}_{2}$ studied. The Fourier transform of EXBIFS showed two peaks originated from first and second neighbors around silicon and oxygen ions. Model calculations of EXBIFS of amorphous SiO$\text{}_{2}$ were performed in terms of single scattering of spherical waves and compared with experimental results.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 649-656
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission and Inverse Photoemission Studies of SiO$\text{}_{2}$
    Autorzy:
    Sobczak, A.
    Nietubyć, R.
    Sobczak, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931764.pdf
    Data publikacji:
    1994-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Kz
    71.25.Tn
    79.60.Ht
    Opis:
    Occupied and unoccupied electron states of amorphous silicon dioxide film supported on Si crystal are studied by using X-ray photoemission and, for the first time, X-ray inverse photoemission (X-ray bremsstrahlung isochromat method). A special care was undertaken to minimize decomposition of silicon oxide during X-ray bremsstrahlung measurements. The experimental spectra are compared with theoretical band structure calculations for amorphous SiO$\text{}_{2}$ from the literature and good overall agreement is found.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 5; 837-843
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of Free Electron Lasers in Biology and Medicine
    Autorzy:
    Pełka, J.
    Tybor, K.
    Nietubyć, R.
    Wrochna, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539156.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.59.-e
    41.60.Cr
    07.85.Qe
    82.53.Ps
    87.64.Bx
    Opis:
    The advent of free electron lasers opens up new opportunities to probe the dynamics of ultrafast processes and the structure of matter with unprecedented spatial and temporal resolution. New methods inaccessible with other known types of radiation sources can be developed, resulting in a breakthrough in deep understanding the fundamentals of life as well as in numerous medical and biological applications. In the present work the properties of free electron laser radiation that make the sources excellent for probing biological matter at an arbitrary wavelength, in a wide range of intensities and pulse durations are briefly discussed. A number of biophysical and biomedical applications of the new sources, currently considered among the most promising in the field, are presented.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 427-432
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Partial Probabilities of X-Ray Bremsstrahlung Transitions
    Autorzy:
    Nietubyć, R.
    Sobczak, E.
    S̆imůnek, A.
    Vackár̆, J.
    S̆ipr, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963394.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Kz
    78.70.-g
    Opis:
    High-energy electrons bombarding a solid produce X-ray bremsstrahlung radiation, which is one of few elementary processes occurring during electron-solid interactions. Photon emission results from electron transition to an unoccupied electron state above the Fermi level. In this work matrix elements of X-ray bremsstrahlung transitions were calculated for solids containing elements from N (Z=7) to Pd (Z=46) and photon energies 1487 eV and 5415 eV. It was found that in the case of light elements the X-ray bremsstrahlung transitions to s-type final states dominate over all other symmetries. It was also shown that X-ray bremsstrahlung transition probabilities increase with decreasing photon energy and increasing atomic number Z. Dependence of X-ray bremsstrahlung transition probabilities on the electron final state energy is also presented in this work.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 841-846
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Absorption Studies of Fe$\text{}_{73.5}$Cu$\text{}_{1}$Nb$\text{}_{3}$Si$\text{}_{15.5}$B$\text{}_{7}$ Amorphous and Nanocrystalline Alloys
    Autorzy:
    Swilem, Y.
    Sobczak, E.
    Nietubyć, R.
    Ślawska-Waniewska, A.
    Dynowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963401.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    61.10.Ht
    75.50.Bb
    Opis:
    The nanocrystalline state of the formally amorphous alloy Fe$\text{}_{73.5}$Cu$\text{}_{1}$Nb$\text{}_{3}$Si$\text{}_{15.5}$B$\text{}_{7}$ is achieved by a heat treatment at temperatures between 500°C and 600°C. The XANES and EXAFS methods were applied for investigation of local structure and chemical bonding around Fe atoms in amorphous and nanocrystalline alloys. The Fe K absorption spectra were measured in the transmission mode at room temperature for Fe$\text{}_{73.5}$Cu$\text{}_{1}$Nb$\text{}_{3}$Si$\text{}_{15.5}$B$\text{}_{7}$ amorphous and nanocrystalline alloys and compared with the spectra for Fe metallic foil and Fe$\text{}_{3}$Si polycrystalline samples.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 883-886
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    C$\text{}_{60}$FeC$\text{}_{60}$ Complexes in Fe Intercalated Fullerite Studied by X-Ray Absorption
    Autorzy:
    Sobczak, E.
    Traverse, A.
    Nietubyć, R.
    Swilem, Y.
    Byszewski, P.
    Żymierska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963400.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Ht
    61.48.+c
    71.20.Tx
    Opis:
    The aim of Fe K edge XANES and EXAFS studies is to reveal the local structure around Fe ions in C$\text{}_{60}$Fe$\text{}_{x}$ intercalated fullerites. The measurements are performed in transmission mode at LN$\text{}_{2}$ temperature for C$\text{}_{60}$Fe$\text{}_{x}$ powder samples and other materials: ferrocene Fe(C$\text{}_{5}$H$\text{}_{5}$)$\text{}_{2}$, Fe metal foil and α-Fe$\text{}_{2}$O$\text{}_{3}$. The main result is that the XAFS spectra of the C$\text{}_{60}$Fe$\text{}_{2}$ intercalate is almost identical to that of ferrocene and very different from α-Fe and α-Fe$\text{}_{2}$O$\text{}_{3}$. The results support opinion that in the C$\text{}_{60}$Fe$\text{}_{x}$ intercalates the ferrocene-like bonds in complexes C$\text{}_{60}$FeC$\text{}_{60}$ are formed. Additionally, the XAFS spectra showed that neither remarkable amount of Fe metallic clusters nor oxidized iron particles are present in the C$\text{}_{60}$Fe$\text{}_{x}$ sample.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 877-881
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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