Electron-momentum distributions in singly ionizing C6+-He collisions at intermediate velocities - art. no. 024702

The process of single ionization has been studied in C6+-He collisions at t he collision velocities of 1.17, 1.36, and 1.63 a.u. Ejected electrons were detected in coincidence with the recoil ions. Two components of the electr on-momentum and the full-momentum vector of the recoil ion were measured. F rom these, two-dimensional momentum-space distributions of the continuum el ectrons were deduced, projected parallel or perpendicular to the collision plane, and for several values of the recoil transverse momentum. The distri butions do not show the molecular-orbital-like patterns seen in similar col lisions with singly and doubly charged projectiles. They do tend to lie pre ferentially along a ridge joining the target and projectile velocities, and show an increasing tendency to go in the direction of the projectile, both longitudinally and transversely, as the collision velocity is raised and t he impact parameter lowered. The results are in agreement with classical tr ajectory Monte Carlo predictions for similar systems.