Charge-Changing Collisions of 0.7–2.0 Mev Helium Beams in Various Gases. II. Electron Loss

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The single and double electron loss cross sections σ₀₁, σ₁₂ and σ₀₂ of helium beams have been measured for target gases H₂, He, N₂, O₂, CO₂, CH₄, C₂H₆ and C₃H₈ in the energy range from 0.7 to 2.0 MeV. By using cross sections for carbon-containing molecules, the additive rule was verified for the electron loss processes of helium beams in this energy region. Loss cross sections for a carbon atom were deduced. Empirical formulae for single electron loss cross sections were obtained for atomic targets H, He, C, N and O. The ratio between two single electron loss cross sections, σ₀₁⁄σ₁₂, and the ratio between single and double electron loss cross sections, σ₀₁⁄σ₀₂ are discussed.