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    Wyświetlanie 1-3 z 3
    Tytuł:
    Photoluminescence Analysis of Oxygen Precipitation around Small-Angle Grain Boundaries in Multicrystalline Silicon Wafers
    Autorzy:
    Kato, G.
    Tajima, M.
    Okayama, F.
    Tokumaru, S.
    Sato, R.
    Toyota, H.
    Ogura, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382111.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Ap
    61.72.Qq
    82.80.Rt
    88.40.jj
    Opis:
    We have investigated the correlation between deep-level photoluminescence and the density of small-angle grain boundaries in multicrystalline Si. A deep-level photoluminescence component around 0.87 eV, which we previously ascribed to oxygen precipitates, became lower and higher in the region with high and low density of small-angle grain boundaries, respectively. This can be explained by the differences in the availability of oxygen atoms around respective small-angle grain boundaries. We performed focused ion beam time-of-flight secondary ion mass spectroscopy on special points emitting extremely strong 0.87 eV emission, and detected a clustered area of $\text{}^16O¯$. This is strong evidence for the idea that the 0.87 eV band is due to oxygen precipitates.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 1010-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compensation of Roentgen Exciting System Instability in Conducting X-Ray Fluorescence Analysis of Bioassays
    Autorzy:
    Galchenko, S.
    Kirilenko, E.
    Fokov, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493666.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.En
    82.80.Ej
    87.10.Rt
    Opis:
    Detailed analysis of the backscattering peak in the X-ray fluorescence spectrum was carried out using the Monte Carlo method which is the base of the computer code "SNEGMONT" for simulating the transport of electrons and photons. The calculations show that the intensity of the backscattering peak is directly proportional to the intensity of the exciting radiation. It was found that the intensity of analyzed elements' lines has a strict relation with the intensity of the backscattering peak. The example of determination of lead and zinc concentrations in bioassay is presented. The simulation of an eightfold change of the exciting X-rays intensity which taking into account the obtained strict relation allows to determine the true concentration of elements with an error of no more than 3%.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 531-535
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Mössbauer Spectroscopy in Study of Selected Biochemical Processes
    Autorzy:
    Burda, K.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035750.pdf
    Data publikacji:
    2003-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Ej
    82.39.Jn
    82.35.Np
    82.39.Wj
    82.39.Rt
    Opis:
    The $\text{}^{57}$Fe, $\text{}^{119}$Sn, $\text{}^{129}$I, and $\text{}^{151}$Eu Mössbauer spectroscopy, scanning force microscopy, and optical fluorescence method were applied to study biological systems starting from porphyrins, through cytochromes and cell membranes until such a complex system as photosystem II. In Fe-porphyrin aggregates iron atoms are able to trap an electron exhibiting the mixed valence Fe$\text{}^{3+}$-Fe$\text{}^{2+}$ relaxation process. In ironcytochrome c the presence of two different Fe$\text{}^{3+}$ states are indicated, while in tincytochrome Sn appears in Sn$\text{}^{4+}$ and Sn$\text{}^{2+}$ states. From the temperature dependence of the mean square displacement of the resonance nuclei and from the diffusional broadening of the Mössbauer line it was possible to separate the vibrational, fast collective and slow collective motions in tinporphyrin and in iron- and tin-cytochrome c. The electronic state of iodine in oleic acid, the main constituent of cellular membranes, was determined. The molecular mechanism of triphenyltin interaction with membrane of red blood cells has been suggested and the model of haemolysis has been proposed. In photosystem II, Eu ions replacing calcium showed Eu$\text{}^{3+}$ to Eu$\text{}^{2+}$ transition after illumination with light, which points out the possible role of Ca$\text{}^{2+}$ ions in electron transfer in the process of photosynthetic water splitting process.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 5; 499-509
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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