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    Wyświetlanie 1-8 z 8
    Tytuł:
    Thermodynamic Temperature and Density of Ar(I) for 4S[1/2]0 State in a Facing Target Sputtering System
    Autorzy:
    Yasuda, Y.
    Nishimiya, N.
    Hoshi, Y.
    Suzuki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791238.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.-r
    42.62.Fi
    52.70.-m
    Opis:
    The 4S' [1/2]0 → 4P' [3/2]1 transition of Ar(I) in a facing target sputtering chamber is measured using a Ti:sapphire ring laser at several operating conditions. Doppler width and line intensity are determined by analysis using the Voigt function. The thermodynamic temperature determined from the Doppler width increases linearly with discharge current and gas pressure. The population density from the line intensity is reduced to the reference temperature obtained by interpolating the discharge current to zero. The empirical relationship to describe population density at a discharge current and a gas pressure is discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 560-562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polymerization of Epoxy Resins Studied by Positron Annihilation
    Autorzy:
    Suzuki, T.
    Hayashi, T.
    Ito, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007966.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    83.80.Cq
    Opis:
    The polymerization process of epoxy resins (bisphenol-A dicyanate) was studied using positron-annihilation lifetime spectroscopy. The polymerization from monomer to polymer through a polymerization reaction was followed by positron-annihilation lifetime spectroscopy measurements. Resins kept at curing temperatures (120, 150, and 200°C) changed form from a powder to a solid through a liquid. The size of the intermolecular spaces of the solid samples increased along with the progress of polymerization.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 671-676
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Visible Light Irradiation on Positronium Formation in Polyethylene at Low Temperature
    Autorzy:
    Ito, Y.
    Hirade, T.
    Hamada, E.
    Suzuki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007996.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    The effect of visible light exposing on the ortho-positronium formation in polyethylene was studied. Lifetime spectra of positrons in polyethylene were measured in the temperature range between 50 K and 370 K. It was observed that the visible light quenches the enhancement of ortho-positronium intensity (I$\text{}_{3}$) at lower temperature than ca. 250 K - the glass transition temperature of polyethylene. On the other hand, the lifetime of ortho-positronium component (τ$\text{}_{3}$) was not affected by the presence of the visible light.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 533-538
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Irradiation Effects on Positronium Formation in Polycarbonate Sduring a Positron-Annihilation Experiment
    Autorzy:
    Suzuki, T.
    Kondo, K.
    Hamada, E.
    Ito, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025767.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    The positron-irradiation effect on polycarbonate during a positron-annihilation lifetime spectroscopy experiment was investigated using different intensities of $\text{}^{22}$Na positron sources andγ-irradiated samples. The decrease in I$\text{}_{3}$ was larger for a larger intensity of positron sources. In the case of a weak source (≈ 140 kBq), I$\text{}_{3}$ did not change with the elapsed time for non-irradiated samples. However, for 1 MGy irradiated samples, I$\text{}_{3}$ measured with the weak source increased with the elapsed time. This can be attributed to a decrease in the radicals induced in the irradiated samples by γ-irradiation. In order to explain the change in I$\text{}_{3}$ measured at room and liquid-nitrogen temperatures, several effects, such as radicals, cross-linking, structure change, and charging, need to be considered. Also, it is difficult to explain the change in I$\text{}_{3}$ using only one of these effects.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 3-4; 515-521
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of Shallow Dislocations on 4H-SiC Substrate by Etching Method
    Autorzy:
    Ishikawa, Y.
    Yao, Y.
    Sato, K.
    Sugawara, Y.
    Danno, K.
    Suzuki, H.
    Bessho, T.
    Kawai, Y.
    Shibata, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492539.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uj
    81.65.Cf
    68.37.Lp
    Opis:
    Correlation between dislocation types in epitaxial 4H-SiC and etch pit types on the 4H-SiC wafer surface were investigated by etch pit method and transmission electron microscope. Shallow dislocation on the wafer was found to form round pit without core. The shallow dislocation was estimated half-loop type in wafer and this estimation explains that step-flow growth converts half-loop dislocation into complex dislocation composed by threading dislocation and basal plane dislocation.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-025-A-027
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    F-AlCoPdGe Alloy with Three Types of Pseudo-Mackay Clusters
    Autorzy:
    Sugiyama, K.
    Yubuta, K.
    Yokoyama, Y.
    Suzuki, S.
    Simura, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373510.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.05.cp
    61.44.Br
    Opis:
    The structure of an F-AlCoPdGe alloy was determined by single-crystal X-ray diffraction analysis: space group Pa3̅ (No. 205), Pearson symbol cP1128-142.4, a = 24.4338(4) Å; R1 = 0.0526 for the observed 5106 reflections with $F_0$ > 4.0σ$(F_0)$. The F-AlCoPdGe alloy exhibited three types of pseudo-Mackay clusters (pMCs). The first shell of the Co(13)-pMC at 24d indicated a coordination polyhedron typically found in Al-Co binary approximants; the second shell was a combination of an M icosahedron and an Al icosidodecahedron, where M is a mixed site of Pd and/or Co. The first shell of the Co(14)-pMC at 4b consisted of 20 partially occupied Al positions arranged in a dodecahedral fashion; its second shell was also composed of an M icosahedron and an Al icosidodecahedron. The first shell of the Al(18)-pMC at 4a consisted of a combination of an M cube and an Al octahedron, resulting in the rhombic dodecahedral arrangement; its outer shell structure was similar to those of the other pMCs. The structure of the F-AlCoPdGe phase comprised an arrangement of these three types of pMCs together with interstitially placed Al icosahedra around the Pd/Al(1) and Pd/Al(2) sites.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 588-593
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Coincidence Doppler Broadening Spectroscopy to Hydrocarbons at Different Substance States
    Autorzy:
    Yu, R.
    Suzuki, T.
    Ito, Y.
    Djourelov, N.
    Kondo, K.
    Shantarovich, V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042205.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    82.30.Gg
    78.70.Bj
    Opis:
    Coincidence Doppler broadening spectroscopy was applied to study n-hexane (C$\text{}_{6}$H$\text{}_{14}$), cyclohexane (C$\text{}_{6}$H$\text{}_{12}$) and cyclohexanone (C$\text{}_{6}$H$\text{}_{10}$O), at solid, as well as liquid states. The experiments were performed in parallel with traditional positron annihilation lifetime spectroscopy. Significant positron trapping by oxygen was observed in cyclohexanone; the oxygen effect is stronger in liquid state than in solid one, which can possibly be attributed to positron solvation in polar solution. Coincidence Doppler broadening results for n-hexane and cyclohexane indicate an existence of higher energetic annihilation electrons in Ps-bubble forming liquids than that in solids.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 697-701
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a Pulsed Slow-Positron Beam to Low-Density Polyethylene Film
    Autorzy:
    Hamada, E.
    Oshima, N.
    Katoh, K.
    Suzuki, T.
    Kobayashi, H.
    Kondo, K.
    Kanazawa, I.
    Ito, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2024257.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    A pulsing system for a slow-positron beam was applied to study the region near the surface of low-density polyethylene film using positron-annihilation lifetime measurement. The lifetime and intensity of ortho-positronium near the surface were measured as a function of the incident positron energy (1.6-9.1 keV). The size of intermolecular spaces in the surface region (~ 1500 nm) was larger than that in the bulk region. This tendency was especially strong in the region around 200 nm below the surface. On the other hand, the intensity of ortho-positronium decreased at lower incident positron energies, which was attributed to a decrease in the density of the spur electrons and/or an increase in the number of reemitted positrons from the surface.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 3-4; 373-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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