Abstract
Absolute measurements of cross sections for electron-impact scattering in helium at an angle of 5° have been made for elastic scattering and excitation of the and states and for incident energies of 50-400 eV. Cross-section values of are found to be lower than theoretical Born values by (9.5 ± 5.4)% at 400 eV, (31.5 ± 4.6)% at 100 eV, and (62.5 ± 3.4)% at 50 eV. Deduced values of total excitation cross sections ( eV) are in agreement with other experimental values. Our measurements for elastic scattering agree well with recent theoretical calculations.
- Received 29 July 1969
DOI:https://doi.org/10.1103/PhysRevA.2.1905
©1970 American Physical Society