. 2020 Apr 10;120(9):4056–4110. doi: 10.1021/acs.chemrev.9b00439

Table 2. Theoretical 1s2p Excitation Energies of Oxygen Ions^a.

ion	configuration	symmetry	1s2p (eV)
O	2s²2p⁴	³P	528.8
O¹⁺	2s²2p³	⁴S	533.3
O²⁺	2s²2p²	³P	537.2
O³⁺	2s²2p¹	²P	545.8
O⁴⁺	2s²	¹S	554.6
O⁵⁺	2s¹	²S	562.3

The Hunds rule ground state is given along with the symmetries of the main peaks in the final state¹⁵¹.

Table 2. Theoretical 1s2p Excitation Energies of Oxygen Ionsa.