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Abstract:
The isotope shifts of forbidden transitions in Be- and B-like argon ions are calculated. It is shown that
only using the relativistic recoil operator can provide a proper evaluation of the mass isotope shift,
which strongly dominates over the field isotope shift for the ions under consideration. Comparing the
isotope shifts calculated with the current experimental uncertainties indicates very good perspectives
for a first test of the relativistic theory of the recoil effect in middle-Z ions.
