Electron capture from H₂targets by H⁺and He²⁺ions. Dependence of the cross sections on the orientation of the molecular axis

We study the electron capture process from molecular hydrogen targets by proton and alpha particle impact at high collision velocities. The dependence of the differential cross sections on the orientation of the internuclear axis of H 2 is evaluated within a two effective center approximation for capture to selective final states of the projectile. In particular, the molecular B1B model is applied in the calculations. The molecular orientation effects observed are due to the interference between the scattering amplitudes from the two centers of the target.