Dynamics of proton collisions with acetylene, ethylene and ethane at 30 eV

Abstract

The collision processes, H++C2Hm (m=2,4,6), are studied at 30eV by using time-dependent density functional theory combined with molecular dynamics approach. The reaction channel, electronic density evolution, scattering pattern, total ionization cross sections are presented based on three projectile incident orientations. We find that the primary mechanism of target ionization at 30eV is electron capture, and the bond dilution effect is prevalent in present collisions. The structure of the scattering angle is different in distinct orientations, which is investigated by means of the force which proton is subjected to. The rainbow angle is in reasonable agreement with experimental and other theoretical results. Calculated ionization cross sections increase with increasing C–C bond length except for the orientation parallel to the C–C bond, and the reason is explained by the C–C bond effect.