Measured and simulated distributions of the final excitation energies of the two neutral reaction products formed in 100 meV ${\text{C}}_{60}^{+}+{\text{C}}_{60}^{-}\to {\text{C}}_{60}^{*}+{\text{C}}_{60}$ collisions. The measured E_exc distribution (black circles) reflects the kinetic energy release in the MN process. The blue dashed curve is the simulated result based on input from the present Landau- Zener model calculations when mutual polarization effects and the finite sizes of the collision partners are taken into account. The blue lines in the upper panel display the available final energy levels according to our TD-DFT calculations.