Interaction of molecular beam with thin layer graphene foils**Project supported by the National Natural Science Foundation of China (Grant No. 11575121) and the National Magnetic Confinement Fusion Program of China (Grant No. 2014GB125004).

Abstract

The interaction of MeV molecular ions with thin layer graphene and graphite foils was studied by using a high-resolution electrostatic analyzer. A large number of fragment protons were observed at zero degree (along the beam direction) when the beam was passing through the monolayer graphene foil, which indicates that the electron of the molecular ions can be stripped easily even by the monolayer graphene foil. More trailing than leading protons were found in the energy spectrum, which means significant wake effect was observed in the monolayer graphene foil. The ratio of the numbers of trailing protons over leading protons first increased with the thickness for the much thinner graphene foils, and then decreased with the thickness for the much thicker graphite foils, which indicates that the bending effect of the wake field on the trailing proton varied with the foil thickness.