NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Cesium (Cs)

Atomic Number = 55

Atomic Weight = 132.9054

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Cs I  Ground State 1s22s22p63s23p63d104s24p64d105s25p66s 2S1/2
       Ionization energy  31406.46769 cm-1 (3.893905 eV)   Ref. WS87

Cs II Ground State 1s22s22p63s23p63d104s24p64d105s25p6 1S0
       Ionization energy  186777.4 cm-1 (23.15744 eV)   Ref. S81