NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Thallium (Tl)

Atomic Number = 81

Atomic Weight = 204.3833

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Tl I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p 2P1/2
       Ionization energy  49265.91 cm-1 (6.108194 eV)   Ref. BC85

Tl II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s2 1S0
       Ionization energy  164765 cm-1 (20.4283 eV)   Ref. M58