Abstract
PROF. A. FOWLER has worked out (Proc. Roy. Soc., 110, 476, 1926) with much elaboration the main spectral characteristics of O 11, but has not been able to obtain the fundamental levels because the jumps to them produced lines which were below 700 Å.U. With our high resolution hot-spark spectroscopy for the extreme ultra-violet and assisted by the new methods of identification of multiplet structure recently worked out by Russell, Hund, Heisenberg, and Pauli, and applied by R. H. Fowler and D. R. Hartree (Proc. Roy. Soc.) to the classification of Fowler's O 11 terms, we have succeeded in accurately fixing these fundamental levels as is shown in the accompanying table. Russell assisted us in this search by placing at our disposal his unpublished identification of the quartet p level, which should replace the x3 level in Fowler and Hartree's classification.
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BOWEN, I., MILLIKAN, R. The Ionisation Potential of O 11. Nature 118, 410 (1926). https://doi.org/10.1038/118410a0
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DOI: https://doi.org/10.1038/118410a0
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