NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Thulium (Tm)

Atomic Number = 69

Atomic Weight = 168.93421

Reference E95

Isotope    Mass       Abundance Spin Mag Moment
169Tm 168.93421 100% 1/2 -0.2316
Tm I  Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f136s2  27/2
      Ionization energy  49879.8 cm-1 (6.18431 eV)   Ref. C71
Tm II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f13(27/2)6s  (7/2,1/24
      Ionization energy  97200 cm-1 (12.05 eV)   Ref. SR65