NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Potassium (K)

Atomic Number = 19

Atomic Weight = 39.0983

Reference E95


Isotope   Mass       Abundance Spin Mag Moment

39K       38.963707  93.2581%  3/2  +0.39146
40K       39.963999  0.012%    4    -1.298
41K       40.961825  6.7302%   3/2  +0.21487

 
K I  Ground State 1s22s22p63s23p64s  2S1/2
     Ionization energy  35009.8140 cm-1 (4.3406633 eV)   Ref. SC85
 
K II Ground State 1s22s22p63s23p6  1S0
     Ionization energy  255100 cm-1 (31.63 eV)   Ref. K87