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The spectrum of atomic promethium has been observed with a variety of light sources and spectrographs. The Zeeman effect has also been recorded. Analysis of the spectrum shows that the ground configuration of the neutral promethium atom is 4 f  5 6 s  2 . The relative positions (in cm -1 ) of the low levels of this configuration are: [Table: see text] This group represents all levels of 4 f  5 6 s  2 expected below 14,000 cm -1 . From these results the following values of interaction parameters and their estimated uncertainties have been inferred:ζ   4  f    =  925  ±  20cm    -  1         E  3   =  510  ±  20cm    -  1Data on 209 upper levels of even parity and 714 classified lines are given.

Fundamental energy levels of neutral promethium (Pm I)