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 Beq+ (q=2-4) and Bq+(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 HeBeq+ and HeBq+ 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. (orig.)