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    Wyświetlanie 1-5 z 5
    Tytuł:
    Measurement of Energy Loss Straggling of Relativistic Electrons in Thin Aluminum Foils
    Autorzy:
    Ramesh Babu, S.
    Badiger, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398918.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.50.Bw
    Opis:
    The mean energy loss straggling per unit path length of relativistic electrons in aluminum has been determined by recording electrons with a Si(Li) detector coupled to 8K multi channel analyzer. The energy loss straggling is determined by measuring the full width at half maximum of the spectrum of the incident and transmitted internal conversion electrons of energies 942 keV and 1016 keV from Bi²⁰⁷ source. Measured values have been compared with theoretical values indicating that the present method can be used for measuring mean energy loss straggling.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1118-1123
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of Semiladder Polymer Foils
    Autorzy:
    Jarząbek, B.
    Orlik, T.
    Cisowski, J.
    Schab-Balcerzak, E.
    Sęk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014521.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Me
    71.20.Rv
    Opis:
    Optical transmission of amorphous polyimidazopyrrolone foils (pyrrons) were investigated in the spectral range 200-3300nm. The investigated materials exhibit a high transmission level (up to 85%) in a wide range from about 500 to 2750nm. The short wavelength edge of transmission depends on the pyrron chemical structure being different for ether-, amide- and ester bridges. When analysing the experimental data, we applied the approach used for amorphous materials in order to determine the electronic structure parameters which may be related to the influence of polyimidazopyrrolone bridge structure and structural disorder on the optical properties and probable electronic transitions.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 655-659
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-Loss of Positrons in Foils
    Autorzy:
    Schneider, H.
    Tobehn, I.
    Rückert, M.
    Brinkmann, U.
    Hippler, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929110.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.+p
    29.25.-t
    34.80.Dp
    Opis:
    The Giessen slow positron source TEPOS delivers intense beams in the energy range between some eV and 6 keV; with postacceleration up to 80 keV. Results for remoderation are described shortly. Further the energy-losses of positrons with incident energy of 6-20 keV through thin aluminium foils were measured. Cross sections for K- and L-shell ionization of thin silver and gold targets by positron and electron impact have been determined at projectile energies of 30-70 keV. The experimental results are presented in detail; they are confirmed by calculations in plane-wave-Born approximation which include an electron exchange term and account for the deceleration or acceleration of the incident projectile in the nuclear field of the target atom.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 375-380
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a Pulsed High Current Facility for Accelerating Metal Foils for Hydrodynamic Materials Testing
    Autorzy:
    Graneau, N.
    Omar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807925.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.70.+p
    84.30.Ng
    62.50.Ef
    Opis:
    A new pulsed power machine to be called AMPERE is currently under development at AWE. Its initial use will be as a metallic foil accelerator for the specific purpose of applying large impulses (>300 Pa s) and pressures (>450 G Pa) to a target for material property testing. The critical circuit features are described and a computer model has been written to predict the expected machine performance. Future uses of this facility for driving further hydrodynamic experimentation are also discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1086-1088
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Optical and Electrical Properties of PET Foils by He⁺, Ne⁺ and Ar⁺ Implantation
    Autorzy:
    Droździel, A.
    Turek, M.
    Pyszniak, K.
    Prucnal, S.
    Luchowski, R.
    Grudziński, W.
    Klimek-Turek, A.
    Partyka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033733.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Me
    78.30.Jw
    61.82.Pv
    Opis:
    Thin (3 μm) polyethylene terephthalate (PET) foils were irradiated with 135 keV He⁺, Ne⁺ and Ar⁺ ions with the fluences up to 5×10¹⁵ cm¯². Changes of chemical structure of the polymer were studied with the Fourier transform infrared and Raman spectroscopy - breaking of numerous chemical bonds, polymer chain cross-linking as well as formation of sp² hybridised carbon clusters and cluster networks were demonstrated. The increase of the implanted sample absorbance with the implantation fluence in the UV-VIS spectra as well as the decrease of optical band-gap energy (2.75 and 2.0 eV for He and Ne, respectively, at 5×10¹⁵ cm¯²) are observed. Decrease of bulk resistance of heavily treated samples by ≈5 orders of magnitude is determined. Measurements of the sheet resistance confirm that the sample becomes conducting also on the reverse (unimplanted) side of the foil. Both of these effects depend on the impinging ion mass - they are the strongest for Ar. The increase of both ac conductance and dielectric constant is observed in the frequency range up to 2 MHz and these changes rise with the impinging ion mass.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 264-269
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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