| Index | Element | I.S. | Z | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
| 1 | Ni | Li | 28 | 1S22S | 2399.23 | THR | R5 | ||
| 2 | Ni | Li | 28 | 1S22S | 2399.29 | +2.4E-1 | SEMP | R40 | |
| 3 | Ni | Li | 28 | 1S22S | 2399.56 | THR | R6 | ||
| 4 | Ni | Li | 28 | 1S22S | 2403.86 | THR | R2 | ||
| 5 | Ni | Li | 28 | 1S22S | 2403.86 | THR | R3 | ||
| 6 | Ni | Li | 28 | 2S | 2S1/2 | 2399.2 | COMP | R300 | |
| 7 | Ni | Li | 28 | 2S | 2S1/2 | 2399.2 | 6.E-1 | COMP | R401 |
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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