Absolute elastic differential electron scattering cross sections for He: A proposed calibration standard from 5 to 200 eV
- 1 April 1980
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 21 (4) , 1134-1151
- https://doi.org/10.1103/physreva.21.1134
Abstract
Absolute differential, integral, and momentum-transfer cross sections for electrons elastically scattered from helium are reported for the impact energy range of 5 to 200 eV. Angular distributions for elastically scattered electrons are measured in a crossed-beam geometry using a collimated, differentially pumped atomic-beam source which requires no effective-path-length correction. Below the first inelastic threshold the angular distributions were placed on an absolute scale by use of a phase-shift analysis. Above this threshold, the angular distributions from 10° to 140° were fitted using the phase-shift technique, and the resulting integral cross sections were normalized to a semiempirically derived integral elastic cross section. Depending on the impact energy, the data are estimated to be accurate to within 5 to 9%.Keywords
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