Numerous weaker features reside beyond peaks C1 and D1 (C2-C8, D2-D6) that report on the vibrational structure of the 3 g a ∏  and 1 g A ∏  excited states (Tables and). In the 3 g a ∏  state, there appears to be a progression of a vibrational feature with a frequency of 685(11) cm -1 as well as the appearance of the vibrational fundamental and combination bands involving a mode with frequency of 130(5) cm -1 . Similarly, in the 1 g A ∏  state, there appear to be two progressions in features with average spacings of 112 (12) and 705(19) cm -1 . While we do not have theoretical calculations to make definitive assignments to these features, their relative spacing are close to those of the v1 and v2 vibrational modes that dominate the structure in the ground state of spectrum NiO2. We thus tentatively assign the observed structure to activity along the v1 and v2 vibrational modes of NiO2 in the ).