NIST Atomic Spectroscopic Database
Ground States and Ionization Energies: Ca
Calcium, Z = 20
- Ca I
- Ca I isoelectronic sequence
- Ground state 1s22s22p63s23p64s2 1S0
- Ionization energy 49305.95 ± .08 cm-1
- References on
Energy Levels
- Ca II
- K I isoelectronic sequence
- Ground state 1s22s22p63s23p64s 2S1/2
- Ionization energy 95751.87 ± .03 cm-1
- References on
Energy Levels
- Ca III
- Ar I isoelectronic sequence
- Ground state 1s22s22p63s23p6 1S0
- Ionization energy 410642 ± 2 cm-1
- References on
Energy Levels
- Ca IV
- Cl I isoelectronic sequence
- Ground state 1s22s22p63s23p5 2Pº3/2
- Ionization energy 542600 ± 1000 cm-1
- References on
Energy Levels
- Ca V
- S I isoelectronic sequence
- Ground state 1s22s22p63s23p4 3P2
- Ionization energy 681600 ± 1300 cm-1
- References on
Energy Levels
- Ca VI
- P I isoelectronic sequence
- Ground state 1s22s22p63s23p3 4Sº3/2
- Ionization energy 877400 ± 2000 cm-1
- References on
Energy Levels
- Ca VII
- Si I isoelectronic sequence
- Ground state 1s22s22p63s23p2 3P0
- Ionization energy 1026000 ± 2000 cm-1
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Energy Levels
- Ca VIII
- Al I isoelectronic sequence
- Ground state 1s22s22p63s23p 2Pº1/2
- Ionization energy 1187600 ± 1000 cm-1
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Energy Levels
- Ca IX
- Mg I isoelectronic sequence
- Ground state 1s22s22p63s2 1S0
- Ionization energy 1520640 ± 500 cm-1
- References on
Energy Levels
- Ca X
- Na I isoelectronic sequence
- Ground state 1s22s22p63s 2S1/2
- Ionization energy 1704047 ± 50 cm-1
- References on
Energy Levels
- Ca XI
- Ne I isoelectronic sequence
- Ground state 1s22s22p6 1S0
- Ionization energy 4774000 ± 3000 cm-1
- References on
Energy Levels
- Ca XII
- F I isoelectronic sequence
- Ground state 1s22s22p5 2Pº3/2
- Ionization energy 5301000 ± 10000 cm-1
- References on
Energy Levels
- Ca XIII
- O I isoelectronic sequence
- Ground state 1s22s22p4 3P2
- Ionization energy 5861000 ± 12000 cm-1
- References on
Energy Levels
- Ca XIV
- N I isoelectronic sequence
- Ground state 1s22s22p3 4S3/2
- Ionization energy 6595000 ± 13000 cm-1
- References on
Energy Levels
- Ca XV
- C I isoelectronic sequence
- Ground state 1s22s22p2 3P0
- Ionization energy 7215000 ± 14000 cm-1
- References on
Energy Levels
- Ca XVI
- B I isoelectronic sequence
- Ground state 1s22s22p 2Pº1/2
- Ionization energy 7860000 ± 16000 cm-1
- References on
Energy Levels
- Ca XVII
- Be I isoelectronic sequence
- Ground state 1s22s2 1S0
- Ionization energy 8770000 ± 18000 cm-1
- References on
Energy Levels
- Ca XVIII
- Li I isoelectronic sequence
- Ground state 1s22s 2S1/2
- Ionization energy 9338000 ± 1157.8 cm-1
- References on
Energy Levels
- Ca XIX
- He I isoelectronic sequence
- Ground state 1s2 1S0
- Ionization energy 41366000 ± 8000 cm-1
- References on
Energy Levels
- Ca XX
- H I isoelectronic sequence
- Ground state 1s 2S1/2
- Ionization energy 44117410 ± 20 cm-1
- References on
Energy Levels
