For Ada-CN + , the spectrum consists of two bands (in the considered energy range, up to 6 eV), which is in agreement with the recently reported experimental spectrum . The first, lower energy band (at 0.7-3 eV) is mainly made up of transitions to D 2 and D 5 states. At that, the D 0 → D 5 transition shows vibronic progression, whereas the D 0 → D 2 transition is structureless. The second band (at 3-5.5 eV) comprises transitions to D 11 and D 14 , and weaker transitions to D 12 and D 15 . Here, the D 0 → D 11 transition demonstrates some vibronic progression. Overall, the spectrum is in semi-quantitative agreement with the experimental EPD spectrum .