Index | Element | I.S. |  Z  | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
1 | Be | Be | 4 | 1S22S2 | 9.31557 | +9.3E-4 | THR | R10 | |
2 | Be | Be | 4 | 1S22S2 | 9.32273 | +9.3E-6 | EXP | R11 | |
3 | Be | Be | 4 | 1S22S2 | 9.323 | COMP | R1 | ||
4 | Be | Be | 4 | 2S2 | 1S0 | 9.322632 | COMP | R400 | |
5 | Be | Be | 4 | 2S2 | 1S0 | 9.322 | COMP | R325 | |
6 | Be | Be | 4 | 9.32 | COMP | R406 | |||
7 | Be | Be | 4 | 9.322 | 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