NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Erbium (Er)

Atomic Number = 68

Atomic Weight = 167.26

Reference E95


Isotope    Mass        Abundance Spin Mag Moment

162Er      161.928775  0.14%     0    
164Er      163.929198  1.61%     0    
166Er      165.930290  33.6%     0    
167Er      166.932046  22.95%    7/2  -0.5665
168Er      167.932368  26.8%     0    
170Er      169.935461  14.9%     0    

 
Er I  Ground State 1s22s22p63s23p63d104s24p64d105s25p64f126s2  3H6
      Ionization energy  49262 cm-1 (6.1077 eV)   Ref. WSPC78
 
Er II Ground State 1s22s22p63s23p63d104s24p64d105s25p64f12(3H6)6s  (6,1/2)13/2
      Ionization energy  96200 cm-1 (11.93 eV)   Ref. SR65