Data obtained as energy-loss spectra at angles from 0 to 7.3x10-3 rad (c.m.) with typical energy-loss resolution of 0.7 eV and angular resolution of 2x10-3 rad (c.m.) were used to calculate average differential cross sections dσdΩav for elastic scattering, direct excitation of the individual He(n=2) states, and direct excitation of the He+(n=2) states. The total cross section for excitation of the He(n=2) states obtained by integrating the differential cross sections was found to be 20x10-18 cm2 at 25 keV (lab) decreasing to 7x10-18 cm2 at 140 keV. At incident lab energies below 100 keV the He(2S2) and He(2P3) states dominate the He(n=2) structure at angles close to zero, while the He(2P1) state dominates at larger angles. The contribution of the He(2S1) state remains below 25% at all angles and energies. © 1973 The American Physical Society.
V. Pol et al., "Absolute Differential Elastic- And Inelastic-scattering Cross Sections In 25-140 KeV He+ + He Collisions," Physical Review A, vol. 8, no. 6, pp. 2990 - 3000, American Physical Society, Jan 1973.
The definitive version is available at https://doi.org/10.1103/PhysRevA.8.2990
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01 Jan 1973