Abstract
IT has long been realized in the field of molecular spectra that there is need of some form of molecule-building principle equivalent to the Atombau principle of Bohr. This would enable the electron configuration and term type of at least the ground-state of any molecule to be predicted from its position in the Periodic Table. Mulliken1 attempted to trace the change in electron configuration from molecule to molecule for the lighter members of the Table, but his pioneering work was hampered by the absence of many necessary spectrum data, and no progress has since been made. In particular, very little knowledge has been obtained on the configuration of the heavier diatomic molecules.
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