NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Holmium (Ho)

Atomic Number = 67

Atomic Weight = 164.93032

Reference E95

Isotope    Mass       Abundance Spin Mag Moment
165Ho 164.93032 100% 7/2
Ho I  Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f116s2  415/2
      Ionization energy  48567 cm-1 (6.0215 eV)   Ref. WSPC78
Ho II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f11(415/2)6s  (15/2,1/28
      Ionization energy  95200 cm-1 (11.80 eV)   Ref. MZH78