NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Rubidium (Rb)

Atomic Number = 37

Atomic Weight = 85.4678

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
85Rb 84.911794 72.17% 5/2 +1.35302 87Rb 86.909187 27.83% 3/2 +2.7512
Rb I  Ground State 1s22s22p63s23p63d104s24p65s  2S1/2
      Ionization energy  33690.81 cm-1 (4.177128 eV)   Ref. J61b
Rb II Ground State 1s22s22p63s23p63d104s24p6  1S0
      Ionization energy  220105.0 cm-1 (27.2895 eV)   Ref. R75