Abstract
The single ionizing collision between an incident electron and an atom/molecule ends up two kinds of outgoing electrons called scattered and ejected electrons. As features of electron impact ionization, these two types of electrons are indistinguishable. Double differential cross-sections (DDCS) can be obtained by measuring the energy and angular distributions of one of the two outgoing electrons with an electron analyzer. We used He, Ar, H2, and CH4targets in order to understand the ionization mechanisms of atomic and molecular systems. We measured differential cross-sections (DCS) and double differential cross-sections at 250 eV electron impact energy. The elastic DCSs were measured for He, Ar, H2, and CH4, whereas the inelastic DCSs of He were obtained for 21P excitation level for 200 eV impact electron energy.
Highlights
Atomic and molecular physics lead to discoveries about the structure of matter at the atomic or molecular level and explain natural laws
Three sets of absolute measurements of differential cross-sections (DCS), integral cross-sections (ICSs), and momentum transfer cross-sections (MTCSs) for elastic electron-CH4 scattering were done by Vuskovic and Trajmar [72] at 20, 30, and 200 eV and by Sakae et al [99] in the 75–750 eV energy range
We reported double differential cross-sections measured using an apparatus originally developed for coincidence measurements of ejected and scattered electrons [114,115,116,117,118]
Summary
Atomic and molecular physics lead to discoveries about the structure of matter at the atomic or molecular level and explain natural laws. These goals can be achieved with collision methods. An intensive effort of experimental and theoretical work has been devoted to the study of ionization differential cross-sections of atoms and molecules through electron impact. Differential crosssections (DDCS) of ionization, as a function of ejected energy, Eb, and the angle of the ionized electron, θb, contain valuable information about both the collision dynamics and the internal structure of atomic or molecular systems.
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