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
133Cs 132.905429 100% 7/2 +2.579
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