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

Abstract

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 dierential 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 dierential cross-sections for asymmetric geometry for dierent kinematical situations. The experiments are carried out on a newly developed electron spectrometer constructed in Afyonkarahisar, Turkey.

Double Differential Cross-Sections for Electron Impact Ionization of Atoms and Molecules

“…The apparatus has been used to measure the triple differential cross-sections for the electron-impact double excitation of helium [123,124], for the electron impact ionization of Argon [115] and H 2 [114]. And also the apparatus has the capability to measure differential cross-sections of the ionization of the atoms and molecules with electron impact [125].…”

Secondary Electron Distribution of Atmospheric Nitrogen Molecule by 350 eV Electron Impact

“…The electron spectrometer is a crossed-beams type in which the incident electron beam collides orthogonally with the target gas beam and has been used to measure the triple differential crosssections (TDCS) for the electron-impact double excitation of helium [14,15], for the electron impact ionization of argon [16] and H 2 [17,18].The electron spectrometer was initially designed and constructed to measure angular and energy correlations between outgoing electrons. The same apparatus can also collect data on angular distribution of ejected or scattered electrons simply disabling the coincident circuit [19,20]. In this paper, we report DDCSs measured by using electron spectrometer originally developed for coincidence measurements of ejected and scattered electrons.…”