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The electron emission pattern of transfer-ionization in collisions ofHe$^{2+}$ with He was investigated for impact velocities between 0.53 a.u. and0.77 a.u. (7 keV/u - 15 keV/u) employing recoil-ion momentum spectroscopy. Thisprocess is known to be dominated by the promotion of the 2p$\pi$ molecularorbital into the continuum which results in "banana" shaped areas of highelectron momentum densities extending from the target to the projectile invelocity space in the collision plain. Asymmetries are explained by a coherentsuperposition of the 2p$\pi$ channel of the quasi molecular promotion with the1s$\sigma$ channel. Here we report on an additional contribution of higherangular momentum molecular states for close collisions which emerge at smallerimpact velocities. They show up as highly structured electron emission patternsin the plane perpendicular to the direction of impact.

Quasi-molecular electron promotion beyond the 1s$\sigma$ and 2p$\pi$ channels in slow collisions of He$^{2+}$ and He