Direct evidence for projectile electronic structure effects in slow multielectron capture collisions

We investigate the role of the electronic structure of the projectile in ionization and subsequent fragmentation of CO${}_2$ induced by multielectron capture in collisions at 0.31 a.u. impact velocity. Focusing on the ${\text{CO}}_2^{3+}\to {\text{O}}^{+}:{\text{C}}^{+}:{\text{O}}^{+}$ break-up channel as a representative channel, we report kinetic energy release distributions (KERDs) for collisions with equi-velocity N${}^{q+}$ and O${}^{q+}$ projectiles. We consider two complementary categories of measurements. In the first category, in which different projectiles of the same charge are considered, we find that KERDs obtained with N${}^{q+}$ and O${}^{q+}$ impact ($q=4,6$) are broadly similar, but they differ significantly from the earlier reported KERD with Ar${}^{q+}$ impact. In the second category, pronounced differences are observed between the KERDs obtained with isoelectronic N${}^{q+}$ and O${}^{(q+1)+}$ ($q=3,5,7$) projectiles. These results provide direct evidence that projectile electronic structure plays a critical role in multielectron capture collisions.