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
203Tl 202.972320 29.52% 1/2 +1.6223 205Tl 204.974401 70.48% 1/2 +1.6382
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