| Index | Element | I.S. | Z | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
| 1 | Li | Li | 3 | 1S22S | 5.04392 | THR | R3 | ||
| 2 | Li | Li | 3 | 1S22S | 5.38708 | THR | R4 | ||
| 3 | Li | Li | 3 | 1S22S | 5.39177 | +5.4E-4 | SEMP | R40 | |
| 4 | Li | Li | 3 | 1S22S | 5.392 | COMP | R1 | ||
| 5 | Li | Li | 3 | 2S | 2S1/2 | 5.391721 | 2.2E-06 | COMP | R400 |
| 6 | Li | Li | 3 | 2S | 2S1/2 | 5.392 | COMP | R325 | |
| 7 | Li | Li | 3 | 5.39 | COMP | R406 | |||
| 8 | Li | Li | 3 | 5.391 | COMP | R407 |
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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