Abstract
The absorption spectrum of europium has been studied at high resolution in the wavelength region between 2200 and 2100 Å. Two Rydberg series were found converging towards the
9
S
4
and
7
S
3
levels of the configuration 4f
7
6s in Eu II. The first series is perturbed near the series limit and the second shows strong autoionization features. A value of 45734.9 ± 0.2 cm
-1
is deduced for the first ionization limit.
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18 articles.
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