Total cross sections for charge transfer by multiply charged neon and argon ions colliding with various hydrocarbons at keV energies

Abstract

We have measured single- and multiple-charge transfer cross sections of 2q keV Neq+ (q=2–6) and Arq+ (q=2–9) ions in collisions with CH4, C2H2, C2H4, C2H6, C3H4 [allene, propyne], C3H6, (CH2)3, and C3H8 molecules. Cross sections for total charge transfer were derived by summing up single- and multiple-charge transfer cross sections. Their gross features and scaling properties for the present polyatomic molecules as functions of the incident charge number of primary ions and first ionization potentials of target particles are found to be able to be represented by a scheme of a classical over-barrier model for atomic and simple molecular targets. Apart from the ionization potential, dependences of the present total charge transfer cross sections are found on total number of electrons and the number of bonds in target hydrocarbons.