NIST Atomic Spectroscopic Database
Ground States and Ionization Energies: Eu
Europium, Z = 63
- Eu I
- Eu I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f76s2 8Sº7/2
- Ionization energy 45734.9 ± .2 cm-1
- References on
Energy Levels
- Eu II
- Sm I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f76s 9Sº4
- Ionization energy 90665.9 ± 50 cm-1
- References on
Energy Levels
- Eu III
- Pm I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f7 8Sº7/2
- Ionization energy 201000 ± 800 cm-1
- References on
Energy Levels
- Eu IV
- Nd I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f6 7F0
- Ionization energy 344000 ± 5000 cm-1
- References on
Energy Levels
