Abstract
The isotope shift in the arc spectrum of rhenium was studied in 12 lines for the highly enriched isotopes185Re and187Re by means of a photoelectric recording Fabry-Perot spectrometer with digital data processing. The observed shifts together with results from earlier studies were analyzed by means of the parametric method. The field shift difference between the terms 5d6(5D)6s6D and4D was found to be 40 (5) mK, showing the influence of second-order effects. The parameterz5d, displaying the magnitude of spin-dependent effects in 5d66s, was found to be 1.3 (8) mK. The experimental data are compared with results from non-relativistic Hartree-Fock calculations. The calculated electron densities describe the measured isotope shifts with good accuracy.
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