Direct and charge-transfer scattering of keV-energy H⁺ and He⁺ projectiles from rare-gas atoms to obtain small-angle absolute differential cross sections

L. K. Johnson, R. S. Gao, C. L. Hakes, K. A. Smith, and R. F. Stebbings

Phys. Rev. A 40, 4920 (1989)

Measurements of absolute differential cross sections for direct and charge-transfer scattering of H⁺ and He⁺ by the rare gases have been made. Direct scattering cross sections are reported at 1.5 keV for collisions of H⁺ and He⁺ with Ne, Ar, Kr, and Xe over the laboratory angular range 0.03°­1.0°. Charge-transfer cross sections are reported for the laboratory scattering angles below 1.0° for H⁺-Ar, Kr at 0.5, 1.5, and 5.0 keV, for H⁺-Xe at 5.0 keV, and for He⁺-Ne at 1.5 keV. The data exhibit a wealth of structure over the experimental angular range, and cross sections have been integrated over angle to provide absolute integral cross sections.