One-electron capture by slow doubly charged ions in h and H2

Abstract

Cross sections for one-electron capture by Ba2+, Ti2+, Mg2+, Cd2+, Zn2+, Kr2+ and B2+ in both H and H2 have been determined in the energy range 0.8-40 keV. A tungsten-tube furnace was used to provide a target of highly dissociated hydrogen. Cross sections in H for moderately exothermic processes, which involve pseudo-crossings of potential energy curves at moderate internuclear separations were found to be very large at low velocities. Cross sections for other processes decrease rapidly with decreasing velocity. No clear relationship between cross sections in H and those in H2 is apparent. Measured cross sections are believed to pertain to ground-state primary ions.