Schematic representation of the initial conditions used for the molecular dynamics of the collision of OH⁻ and a methanol ice-mantle. Each blue dot represents an initial position of the OH⁻ projectile, whose O–H axis points toward the center of mass of the methanol cluster (black circle) with its oxygen atom facing the cluster. The 24 points on the surface are evenly distributed such that the solid angle subtended by three closest-neighbor points on the surface and the center of the sphere is sr.