Investigations of the hyperfine structure and isotope shifts in the even-parity level system of atomic europium

Abstract This work presents the measurements of the hyperfine structure constants A and B, as well as the isotope shifts, for 26 electronic levels belonging to the even-parity configurations at the energy range 28000-40000 cm − 1 in the europium atom. The measurements were performed with the use of laser spectroscopy with a hollow cathode discharge lamp as the source of the atoms and the detection of laser induced fluorescence. Among the results obtained, 10 levels were measured for the first time, in the case of another 3 levels results somewhat more precise than the earlier published ones were obtained. The A and B hyperfine structure constants’ values were determined on the basis of the measurements on 73 spectral lines located in two wavelength ranges: 480-560 nm and 625-680 nm.