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 
              
130Ba129.9062820.11%0 
132Ba131.9050420.10%0 
134Ba133.9044862.42%0 
135Ba134.9056656.59%3/2+0.8365
136Ba135.9045537.85%0 
137Ba136.90581211.23%3/2+0.9357
138Ba137.90523271.70%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