Energy and angular distributions of electrons ejected from CH4 and C3H8 under 16.0 keV electron impact

[摘要] Relative cross sections, differential in energy and angle, for electrons ejected from CH4 and C3H8 molecules under 16.0 keV electron impact have been measured. Electrons were analyzed by a 45° parallel plate electrostatic analyzer at emission angles varying from 60° to 135° with energies from 50 eV to 1000 eV. The angular distributions of electrons exhibit structures which are found to arise from Coulomb and non-Coulomb interactions. Furthermore, the double differential cross sections of electrons ejected from C3H8 molecule are found to be higher in magnitude than those from CH4. This result supports the fact that the number of ejected electrons participating in collisions with C3H8 molecules is more than that in CH4. Also, the angular distributions of C–K-shell Auger electrons emitted from the target molecules have been studied and shown to be isotropic within the experimental uncertainty.

[学科分类] 物理（综合）

[关键词] Double differential cross sections;Auger electrons;binary peak;polarization.