NIST Atomic Spectroscopic Database
Ground States and Ionization Energies: Pm
Promethium, Z = 61
- Pm I
- Pm I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f56s2 6Hº5/2
- Ionization energy 44800 ± 160 cm-1
- References on
Energy Levels
- Pm II
- Nd I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f56s 7Hº2
- Ionization energy 87900 ± 600 cm-1
- References on
Energy Levels
- Pm III
- Pr I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f5 6Hº5/2
- Ionization energy 180000 ± 3000 cm-1
- References on
Energy Levels
- Pm IV
- Ce I isoelectronic sequence
- Ground state [Kr] 4d105s25p64f4 5I4
- Ionization energy 331000 ± 5000 cm-1
- References on
Energy Levels
