[en] Ion yields of He⁺ scattered from atomic and solid Pb in the energy range from 200 to 2000 eV into a large scattering angle are reported. The beam results show an oscillatory structure of the ion yield as function of the energy which is comparable to the same effects observed for a solid target. Thus the atomic nature of the quasiresonant charge exchange is confirmed. The data also give evidence for solid-state effects influencing the oscillations of the ion yield. A theoretical model, describing the binary interaction between projectile and target atom by the formation of a quasimolecule, allows a more detailed interpretation of the experimental results. According to this model, the characteristic frequency of the oscillations is a consequence of the quasiresonant electron transfer between the Pb(5d) level and the He(1s) level, whereas the amplitudes depend essentially on the influence of the Auger-neutralisation processes. (orig.)