Abstract
Isotope shifts involving all the stable even-A isotopes of erbium have been studied in four transitions using optical technique and highly enriched isotopes. The value of change in mean-square charge radii δ〈r2〉 deduced from our studies in 5806.05 A (f12 s2-f12 sp) transition is in excellent agreement with muonic X-ray value. With negligible specific mass shift (SMS) in 5806.05 A line, the SMS and field shifts in other lines are compared via King-Plot. In transitions involving change of 4f-electron (e.g., f12s2-f11ds2), large negative SMS value is obtained which is very close to the theoretically predicted value.
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