Abstract
Differential cross sections for electron impact ionization of helium are calculated in the Born approximation for ejected-electron energies below the $n=2$ threshold of the residual ${\mathrm{He}}^{+}$ ion. The resonant features associated with the lowest-lying $^{1}S$, $^{1}P$, and $^{1}D$ helium autoionizing states are analyzed using the Fano line-shape formula. The angular correlation between the two outgoing electrons is expressed as a Legendre-polynomial expansion, and the coefficients are evaluated for representative energy losses and momentum transfers. For an incident-electron energy of 256.5 eV, the predicted angular distribution is in satisfactory agreement with the coincidence measurements of Ehrhardt et al. except near the recoil maximum.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
