A SMALL portion of the spectrum of oxide of lanthanum has been known for some time. The most notable of the old measurements (v. Kayser, “Handbuch der Spektroscopie”, Bd. 5, p. 666, Leipzig, 1910) refer to two groups of bands in the violet at λ4418 and λ4372, and to a pair of bands in the green at λ5600 and λ5626.
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PICCARDI, G. New Bands in the Spectrum of Oxide of Lanthanum. Nature 124, 129 (1929). https://doi.org/10.1038/124129c0
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