| Index | Element | I.S. | Z | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
| 1 | Na | Li | 11 | 1S22S | 299.867 | +3.E-2 | SEMP | R40 | |
| 2 | Na | Li | 11 | 1S22S | 299.872 | THR | R5 | ||
| 3 | Na | Li | 11 | 1S22S | 299.876 | THR | R4 | ||
| 4 | Na | Li | 11 | 1S22S | 299.88 | COMP | R1 | ||
| 5 | Na | Li | 11 | 1S22S | 300.173 | THR | R2 | ||
| 6 | Na | Li | 11 | 1S22S | 300.173 | THR | R3 | ||
| 7 | Na | Li | 11 | 2S | 2S1/2 | 299.8807 | COMP | R400 | |
| 8 | Na | Li | 11 | 2S | 2S1/2 | 299.867 | COMP | R402 |
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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