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Electron removal in collisions of alpha particles with neon dimers is studiedusing an independent-atom-independent-electron model based on the semiclassicalapproximation of heavy-particle collision physics. The dimer is assumed to befrozen at its equilibrium bond length and collision events for the two ion-atomsubsystems are combined in an impact parameter by impact parameter fashion forthree mutually perpendicular orientations. Both frozen atomic target anddynamic response model calculations are carried out using the coupled-channeltwo-center basis generator method. We pay particular attention to inner-valenceNe($2s$) electron removal, which is associated with interatomic Coulombic decay(ICD), resulting in low-energy electron emission and dimer fragmentation. Ourcalculations confirm a previous experimental result at 150 keV/amu impactenergy regarding the relative strength of ICD compared to direct electronemission. They further indicate that ICD is the dominant Ne$^+$ + Ne$^+$fragmentation process below 10 keV/amu, suggesting that a strong low-energyelectron yield will be observed in the ion-dimer system in a regime in whichthe creation of continuum electrons is a rare event in the ion-atom problem.

Indication of strong interatomic Coulombic decay in slow He$^{2+}$-Ne$_2$ collisions