Charge-Changing Collisions of 0.7–2.0 MeV Helium Beams in Various Gases. I. Electron Capture

Abstract

The single and double electron capture cross sections σ₁₀, σ₂₁ and σ₂₀ of heliumions have been measured in target gases of H₂, He, N₂, O₂, CO₂, CH₄, C₂H₆ and C₃H₈ in the energy range from 0.7 to 2.0 MeV. The measured cross sections are compared with other experimental and theoretical values for the target gases of H₂, He, N₂ and O₂. The additive rule for the charge-changing process of helium ions has been verified by using the cross sections for the carbon-containing molecules. Capture cross sections of helium ions in the collisions with carbon atoms have been estimated.