Absorption-line series in Lu I

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Abstract
The absorption spectrum of lutetium vapor in the ultraviolet region has been photographed, using the Argonne thirty-foot spectrograph and an inductively heated furnace. Two hundred lines have been measured with an accuracy of ± 0.004 Å, and approximately 91 % of these have been classified as members of six previously unobserved Rydberg series. Four of these involve transitions from the two lowest lying levels, 5 d 6 s2(2D3/2, 5/2), and two from the first excited multiplet, 6 s2 6 p(2P01/2, 3/2), which is sufficiently populated at the temperature used in the experiment. A value for the first ionization limit of Lu I has been derived from the extrapolation of the serie 5 d 6 s2(2D5/2)-nf 6 s2(2F07/2), which was measured to n = 36 and wich is pratically unperturbed. The value found was 43 762.39 ± 0.10 cm-1