Index | Element | I.S. |  Z  | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
1 | Be | H | 4 | 1S | 217.72 | +1.6E-6 | THR | R8 | |
2 | Be | H | 4 | 1S | 2S1/2 | 217.71865 | COMP | R400 | |
3 | Be | H | 4 | 1S | 2S1/2 | 217.713 | COMP | R325 | |
4 | Be | H | 4 | 1S | 2S1/2 | 217.713 | 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