Electronic Transitions Responsible for C60+ Diffuse Interstellar Bands

Diffuse interstellar bands (DIBs) are puzzling absorption features believed to contain critical information about molecular evolution in space. Despite the fact that C-60(+) recently became the first confirmed carrier of several DIBs, the nature of the corresponding transitions is not understood. Using electronic structure methods, we show that the two strong C-60(+) DIBs cannot be explained by electronic transitions to the two different excited E-2(1g) states or the two spin-orbit components of the lowest E-2(1g) state, as suggested before. We argue that the strong DIBs at 9632 and 9577 angstrom correspond to the cold excitations from the non-Franck-Condon region of the ground electronic state to the two components of the lowest E-2(1g) state split by Jahn-Teller distortion. The weak DIBs at 9428 and 9365 angstrom are assigned to the first vibronic transitions involving the low-energy vibrational modes and components of the lowest E-2(1g) electronic state.