Abstract
IN the course of an analysis of the spectrum of doubly ionised lead (Pb III), the results of which will shortly be published, some combinations of more than usual interest to spectroscopists were found to occur. These combinations involve the anomalous terms arising from the state of the doubly ionised atom of lead when both the two remaining valence electrons occupy 6p orbits. The terms to be expected for this state of the atom are 63&Pmacr;012, 61&Dmacr;2, and 61&Smacr;0.
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SMITH, S. Anomalous Terms in the Spectrum of Doubly Ionised Lead. Nature 123, 566 (1929). https://doi.org/10.1038/123566a0
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DOI: https://doi.org/10.1038/123566a0
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