Index | Element | I.S. |  Z  | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
1 | He | He | 2 | 1S2 | 24.588 | COMP | R1 | ||
2 | He | He | 2 | 1S2 | 24.588 | +2.5E-2 | SEMP | R42 | |
3 | He | He | 2 | 1S2 | 24.5893 | THR | R8 | ||
4 | He | He | 2 | 1S2 | 1S0 | 24.58741 | 8.5E-06 | COMP | R400 |
5 | He | He | 2 | 1S2 | 1S0 | 24.587 | COMP | R325 |
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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