Index | Element | I.S. |  Z  | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
1 | N | He | 7 | 1S2 | 552.07 | +5.5E-1 | SEMP | R42 | |
2 | N | He | 7 | 1S2 | 552.074 | COMP | R1 | ||
3 | N | He | 7 | 1S2 | 552.076 | THR | R8 | ||
4 | N | He | 7 | 1S2 | 1S0 | 552.0718 | COMP | R400 | |
5 | N | He | 7 | 1S2 | 1S0 | 552.057 | 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