NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Einsteinium (Es)

Atomic Number = 99

Atomic Weight = (254)

Reference E95


Isotope    Mass        Abundance Spin Mag Moment

252Es      252.082944  0         5    
253Es      253.084818  0         7/2  4.10
254Es      254.088019  0         7    
255Es      255.090270  0         7/2  

 
Es I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f117s2  4I°15/2
      Ionization energy  51800 cm-1 (6.42 eV)   Ref. S74
 
Es II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f11(4I15/2)7s  (15/2,1/2)°8
      Ionization energy  [97000] cm-1 (12.0 eV)   Ref. CNWM70