Index | Element | I.S. |  Z  | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
1 | F | Be | 9 | 1S22S2 | 157.161 | +3.3E-3 | EXP | R11 | |
2 | F | Be | 9 | 1S22S2 | 157.311 | +1.6E-2 | THR | R10 | |
3 | F | Be | 9 | 2S2 | 1S0 | 157.1652 | COMP | R400 | |
4 | F | Be | 9 | 2S2 | 1S0 | 157.161 | COMP | R325 | |
5 | F | Be | 9 | 2S2 | 1S0 | 157.161 | COMP | R408 |
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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