Stereo‐dynamical ion‐pair formation in collisions of highly‐charged ions with argon dimers

Multiple ionization process of a rare gas dimer BC collided with a slow highly charged ion A q + is investigated with the three‐center Coulombic over‐barrier model previously developed by the present authors. To reveal stereodynamical effects, we calculate asymmetric ion‐pair formation cross sections σ ( Q B , Q C ) as a function of the orientation angle. We introduce a pair of atomic impact parameters b B and b C with which we distinguish the near and far sites. Furthermore, we distinguish the forward and backward emitted ions produced as a result of Coulomb explosion. Partial screening effects are also considered.