Abstract
The absorption spectrum of Eu I between 40 and 300 Å has been recorded. Prominent structure due to the excitation of the 4d subshell has been found. The spectrum closely resembles that reported for Eu metal (Zimkina, Fomichev, Gribovskii & Zhukova 1967), although many additional resonances are resolved in the present work. It is dominated by a ‘giant resonance’, attributed to 4d→(4f, εf) transitions, and occurring above the main threshold for 4d ionization. Identifications of the main features are proposed and are supported by Hartree–Fock calculations. Evidence of a 4d→
n
p series has also been found.
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