Cross sections for formation of NaCl by radiative association. Top: the cross section for the ¹Σ⁺ → ¹Σ⁺ process is depicted from 0.03 eV to 0.8 eV with dE_i = 10⁻⁵ eV. It takes the nonadiabatic coupling into account. Bottom: the cross sections are depicted from 10⁻⁵ eV to 0.8 eV for three different processes: ¹Σ⁺ → ¹Σ⁺, Α¹Π → Χ¹Σ⁺, and Χ¹Σ⁺ → Χ¹ Σ⁺. The green lines represent cross sections up to 0.03 eV taken from Gustafsson (2020). The purple lines represent cross sections calculated here. NAD denotes nonadiabatic dynamics. MG (2020) denotes Gustafsson (2020). A logarithmic scale is used on the x- and y-axes.