We present a many-electron theoretical study of electron capture and e
xcitation in collisions of H+ with Nato clusters for impact energies 4
0-500 eV. The collision is treated semiclassically using the independe
nt electron model, and the cluster is described in the framework of th
e Kohn-Sham formalism with a local-density approximation which include
s exchange, correlation, and a self-interaction correction. We have fo
und that capture cross sections are similar to(2-5)x10(-14) cm(2) and
dominate in the above energy range. In contrast with ion-atom collisio
ns, excitation cross sections are comparable to the former, and multip
le processes such as capture excitation cannot be neglected at low vel
ocities. From the analysis of the vacancies originated in the collisio
n, we have evaluated the energy deposited in the cluster, which is an
essential parameter in the study of cluster fragmentation.