Fig. 1: Potential energy curves.

PECs obtained from refs. ^38,39. Ψ_in represents the incoming wave function with wave number matching an energy of k_B × 220 K. Ψ_b represents the first excited vibrational level of HeAr⁺ at the A₂ electronic state. Ψ_f represents the scattering state wave function of the X state that couples to Ψ_b. Ψ_sc represents the scattering state wave function of the X state with maximal overlap with \(\sqrt{\varGamma }\cdot {\varPsi }_{{\rm{in}}}\). E(e⁻) represents energy distribution of ejected electrons and E(atoms) represents the energy distributed between He and Ar⁺(²P_3/2). All wave functions were calculated using discrete variable representation⁴⁰, the resonance width Γ(R) is taken from ref. ⁴¹.