ELECTRON-CAPTURE AND TARGET EXCITATION IN COLLISIONS OF B-Q-Q+ IONS WITH H AND HE ATOMS AT ENERGIES BELOW 10 KEV( AND BE)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 semiclassi cal molecular representation with six to 22 molecular channels at coll ision energies above 50 eV/u and by using a fully quantum mechanical m olecular 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 pseudopote ntial-modified configuration interaction method or multireference sing le- and double-excitation configuration interaction (MRD-CI) calculati ons. Cross sections for electron capture are summarized in numerical t ables. Target-excitation processes are also examined for some systems and significant effects of these channels on capture channels are disc ussed.