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Wyświetlanie 1-8 z 8
Tytuł:
Secondary Electron Distribution of Atmospheric Nitrogen Molecule by 350 eV Electron Impact
Autorzy:
Ozer, Z.
Ulu, M.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398662.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Gs
Opis:
Electron collisions with nitrogen molecules have an important role for example in ionospheric and auroral phenomena in the upper atmosphere of the Earth. These processes are important in electrical discharges involving atmospheric gases. Due to the key features electron collisions with N₂ have been under particular interest and extensively studied for last decades. Cross-section data is extremely useful in understanding the systematic of the ionization process. Since the earliest cross-section measurements of N₂, there have been a great number of improvements and new developments on theoretical and experimental methods. A crossed-beam apparatus so called electron spectrometer that has an effusive gas source and electron gun is used to obtain the cross-sections. Scattered and ejected electrons are analyzed by hemispherical electron analyzer. Here we report recent measurements of double differential cross-section for N₂ as a function of electron angle at incident electron energy of 350 eV.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 20-22
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double Differential Cross-Section Measurements for Electron Impact Ionization of Helium
Autorzy:
Özer, Z.
Olgaç, F.
Ulu, M.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399891.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
Opis:
The single ionizing collision with an incident electron and atom/molecules ends up two kinds of outgoing electrons called scattering and ejected electrons. As a feature of electron impact ionization these two electrons are indistinguishable. Double differential cross-sections can be obtained by the measurements of energy and angular distributions of one of the two outgoing electrons by a detector. In this perspective, we used He target that is reasonable to expect to understand ionization mechanisms of atomic systems. We have measured double differential cross-sections for asymmetric geometry for different kinematical situations. The experiments are carried out on a newly developed electron spectrometer constructed in Afyonkarahisar, Turkey.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 361-362
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observing Quantum Level Interference Effects with Electron Spectrometer
Autorzy:
Özer, Z.
Ulu, M.
Aktaş, B.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399893.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
34.50.Gb
Opis:
The existence of Young-type interference patterns has been recently searched in triple differential cross-sections for single ionization of $H_2$ molecules by electron impact, and theoretically supported by calculations obtained by different models. The appearance of interference effects arising from the two-centre geometry of diatomic molecule. These effects seen in triple differential cross-sections are described by interference factor in analogy with light waves. In this work, we discuss about that the interference factor for molecular structure of $H_2$ may reproduce Young-type interference patterns depending on scattering angle, initial and ejected electron energies in triple differential cross-sections. Differences are expected in the triple differential cross-sections spectra of ejected electrons according to kinematical conditions imposed by scattering angle and electron energy.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 363-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Double Differential Cross-Section for Electron Impact Ionization of Argon at 348 eV
Autorzy:
Bozkurt, G.
Yavuz, M.
Ozer, Z.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1195074.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
Opis:
In this study, we report the angular distribution of double differential cross sections of ejected electrons from Ar in intermediate energy region. Double differential cross-sections for electron impact ionization of argon have been measured at 348 eV. A hemispherical energy analyzer is used to analyze the ejected electrons with energies between 25 and 325 eV and angles between 25° and 130°.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 343-344
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double Differential Cross-Section Measurements for Methane Molecule at 350 eV
Autorzy:
Yavuz, M.
Isik, N.
Ozer, Z.
Ulu, M.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194671.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Gs
Opis:
Double differential cross-sections have been measured after ionizing electron collisions with methane at primary energy of 350 eV using a conventional electron spectrometer. An electrostatic analyzer was used to measure angular distributions of secondary electrons with energies between 25 eV and 300 eV. Angles of emission were 25° to 130°. It was found that the outgoing electrons belong to one of the two energetically separated groups, either the fast electrons which are scattered mainly in forward direction or the slow electrons which are distributed isotropically into all angles. For higher ejection energies the maxima shifted towards smaller angles as expected from binary type collision.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 442-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Double Differential Cross-Sections for He at Intermediate Energy
Autorzy:
Ozer, Z.
Olgac, F.
Ulu, M.
Aktas, B.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194824.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
Opis:
Detailed studies on ionization of atoms and molecules by electron impact have made numerous contributions to understanding of the structure of atoms and molecules including the interaction between particles. After a ionizing collision a scattered electron, an ejected electron and a recoil ion is formed. Doubly differential cross-sections give detailed information for one of the outgoing electrons. In this study, we report the angular distribution of double differential cross-sections of ejected electrons from He in intermediate energy region.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 341-342
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Experimental and Theoretical Double Differential Cross Sections of CH₄ at 250 eV Impact Energy
Autorzy:
Isik, N.
Yavuz, M.
Aksoy, E.
Ozer, Z.
Ulu, M.
Sahlaoui, M.
Boumediene, L.
Bouamoud, M.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401296.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Gs
Opis:
In this study, experimental and theoretical double differential cross section (DDCS) data for methane-electron interaction mechanism after the impact of a 250 eV electron have been comprehensively determined for a wide energy range of the detected electron, from 50 to 225 eV. The first Born-One Coulomb wave modeling with Gamow factor has been calculated to analyze experimental DDCS results for a correct description of the electron impact ionization of methane molecule. It is found that these theoretical calculations are successful to describe the post-collision interaction effects due to the Coulomb long-range interaction between the outgoing electrons in the final state. A considerable agreement is found between experimental and theoretical results.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1112-1114
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintering Behaviour of ZnO:Cu Ceramics Fabricated by Sol-Gel Derived Powders
Autorzy:
Bahşi, Z.
Oral, A.
Aslan, M.
Kayahan, E.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1491465.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Mh
Opis:
Doped zinc(II) oxide (ZnO:Cu) ceramics were prepared from sol-gel derived nanocrystalline powders. Powders were prepared by dissolving zinc and copper acetates in isopropyl alcohol. Ethanolamine was used to enhance the solubility of acetates. Powders were produced by the calcination of the dried gels at 750°C. The crystal size of the undoped powders were uniform and around 50 nm while grain size of Cu doped powders varied between 0.3 and 2 μm. X-ray mapping of the powders showed that Cu was not homogeneously distributed and some particles had higher Cu content. After pressing of the powders, both doped and undoped ceramics were sintered at 1200C for 2 h. Microstructure of the Cu doped ceramics showed that Cu atoms partially dissolved in ZnO matrix and the rest formed a second phase in the grain boundaries. Average grain size of the ZnO:Cu ceramics was around 30 μm. Relative densities of the ceramics increased from 0.695 to 0.857 by Cu doping.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 271-273
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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