Abstract
The results of measurements of the hyperfine structure of 31 classified and four unclassified spectral lines in the europium atom, obtained by using the laser induced fluorescence method, are presented. On the basis of experimental results, the values of the hyperfine structure constants and the isotope shifts for seven hitherto unmeasured levels belonging to even configurations (among them for three entirely new levels with unknown energies) were determined and the respective values known from literature for another 19 levels were verified. Since the motivation for undertaking investigations within this work was an inconsistency in the semi-empirical description of the hyperfine structure and the isotope shifts for some even levels in the europium atom, a detailed discussion of this problem is presented.
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