Application of positive-ion energy-loss spectrometry has been extended to include experimental determination of absolute excitation cross sections of ground-state helium ions. Helium ion-atom collisions were studied for impact energies ranging between 20-100 keV, in 10-keV intervals. The data were taken with an apparatus resolution between 0.6-0.8 eV full width at half-maximum (FWHM). Cross sections for transitions from ground state to the second and third principal quantum levels of the ion plotted as a function of impact energy were still rapidly increasing at 100 keV. The cross sections at this energy were (1.64 ± 0.28) x 10-18 cm2 for He+(1s122)→He+ (n=2) and (3.46 ± 0.45) x 10-19 cm2 for He+(1s122)→He+ (n=3). © 1971 The American Physical Society.
D. R. Schoonover and J. T. Park, "Absolute Excitation Cross Sections Of He+ In 20-100-keV He+-He Collisions Using Energy-loss Spectrometry," Physical Review A, vol. 3, no. 1, pp. 228 - 234, American Physical Society, Jan 1971.
The definitive version is available at https://doi.org/10.1103/PhysRevA.3.228
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01 Jan 1971