Energy levels and lifetimes are calculated for the resonant states that are important in radiative single charge transfer in He2+-He collisions at thermal energies. The resonant contribution to the charge-transfer rate decreases with increasing temperature and is approximately 12% of the total rate at 300 K.
Bardsley JN, Cohen JS, Wadehra JM. Resonant contributions to single charge transfer between He2+ and He. Phys. Rev. A. 1979;19(5):2129-2130. doi: 10.1103/PhysRevA.19.2129