Charge-changing collisions of 0.7 - 2.0 MeV helium beams in various gases, 1

The single and double electron capture cross sections σ10, σ21 and σ20 of helium ions 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. (author)