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Double Differential Cross-Section Measurements for Electron Impact Ionization of Helium

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Özer Z., Olgaç F., Ulu M., Doğan M.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
361-362
EN
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.
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Observing Quantum Level Interference Effects with Electron Spectrometer

100%
Özer Z., Ulu M., Aktaş B., Doğan M.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
363-364
EN
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.
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