The cryo-SEVI spectrum of NiO2¯ is presented in Figure . Figure shows the lower-eBE region of structure, spanning 24400 -28000 cm -1 and covering the ground state band of the NiO2 ← NiO2¯ photodetachment transition previously observed. The higher-energy region of the spectra shown in Figure spans 27550 -32500 cm -1 and encompasses detachment transitions to excited electronic states of NiO2 as will be discussed in Sections IV.A and IV.D . In both figures, a low-resolution overview spectrum (blue) is displayed above high-resolution composite spectra (black) taken at several photon energies.