Index | Element | I.S. |  Z  | Conf. | Level | ¡÷E (eV) | Method | Ref. | |
1 | Ca | Ar | 20 | 3P6 | 1S0 | 50.90968 | COMP | R400 | |
2 | Ca | Ar | 20 | 3P6 | 1S0 | 50.9135 | 2.E-4 | COMP | R401 |
3 | Ca | Ar | 20 | 3P6 | 1S0 | 50.9135 | 0.0002 | COMP | R403 |
4 | Ca | Ar | 20 | 3P6 | 1S0 | 50.912 | 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