Semi-empirical MN cross section and thermal rate coefficient as functions of center-of-mass collision energy and temperature, respectively. The top panel shows calculated total cross sections for ${\text{C}}_{60}^{+}+{\text{C}}_{60}^{-}\to C_{60}^{*}+C_{60}$ (black), ${\text{C}}_{60}^{+}+{\text{e}}^{-}\to {\text{C}}_{60}$ (red), and ${\text{C}}_{60}+{\text{e}}^{-}\to {\text{C}}_{60}^{-}$ (blue) reactions. The MN thermal rate coefficient is shown in the bottom panel with the black curve. There, the gray area shows the ranges of MN rates obtained using a simple model developed for the neutralization of dust particles in the interstellar medium (Spitzer 1941), which has previously been used to estimate MN rates involving PAH anions in dense molecular clouds (Wakelam & Herbst 2008).