Atomic Energy States of an Unusual Type

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WHEN examining the vacuum spark spectra of light elements, some rather unexpected lines have been observed, which indicate optical energy states extremely high above the ionization limit, having a character approaching that of X-ray levels.

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EDLÉN, B., TYRÉN, F. Atomic Energy States of an Unusual Type. Nature 143, 940–941 (1939) doi:10.1038/143940a0

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