| Index | Element | I.S. | Z | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
| 1 | O | Li | 8 | 1S22S | 138.12 | +1.4E-2 | SEMP | R40 | |
| 2 | O | Li | 8 | 1S22S | 138.123 | THR | R4 | ||
| 3 | O | Li | 8 | 1S22S | 138.124 | THR | R5 | ||
| 4 | O | Li | 8 | 1S22S | 138.2 | THR | R2 | ||
| 5 | O | Li | 8 | 1S22S | 138.2 | THR | R3 | ||
| 6 | O | Li | 8 | 2S | 2S1/2 | 138.1194 | 1.2E-03 | COMP | R400 |
| 7 | O | Li | 8 | 2S | 2S1/2 | 138.116 | COMP | R325 | |
| 8 | O | Li | 8 | 2S | 2S1/2 | 138.116 | COMP | R408 |
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'I.S.' ---------- the isoelectronic sequence
'Z' ---------- atomic number
'Conf.' ---------- configuration
'Level' ---------- the notation of energy level
'E' ---------- the ionization potential
'¡÷E' ---------- error for ionization potential
'Method' ---------- the method by which the data is produced
'Ref.' ---------- the reference