NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Barium (Ba)

Atomic Number = 56

Atomic Weight = 137.327

Reference E95


Isotope    Mass        Abundance Spin Mag Moment

130Ba      129.906282  0.11%     0    
132Ba      131.905042  0.10%     0    
134Ba      133.904486  2.42%     0    
135Ba      134.905665  6.59%     3/2  +0.8365
136Ba      135.904553  7.85%     0    
137Ba      136.905812  11.23%    3/2  +0.9357
138Ba      137.905232  71.70%    0    

 
Ba I  Ground State 1s22s22p63s23p63d104s24p64d105s25p66s2  1S0
      Ionization energy  42034.91 cm-1 (5.211664 eV)   Ref. PVHA85
 
Ba II Ground State 1s22s22p63s23p63d104s24p64d105s25p66s  2S1/2
      Ionization energy  80686.30 cm-1 (10.00383 eV)   Ref. KL99