Electron capture and target excitation in collisions of Bq+and Beq+ions with H and He atoms at energies below 10 keV/u

Electron capture and target excitation in Be q + ( q = 2–4) and B q + ( q = 2–3) + H and He collisions are studied theoretically by using a semiclassical molecular representation with six to 22 molecular channels at collision energies above 50 eV/u and by using a fully quantum mechanical molecular representation with three to five channels below 50 eV/u. The ab initio potential curves and nonadiabatic coupling matrix elements for the HeBe q + and HeB q + systems are obtained from either a pseudopotential-modified configuration interaction method or multireference single- and double-excitation configuration interaction (MRD-CI) calculations. Cross sections for electron capture are summarized in numerical tables. Target-excitation processes are also examined for some systems and significant effects of these channels on capture channels are discussed.