By means of collinear laser spectroscopy at ion beams of Ar +, S + and CI + the isotope shifts of a total of twelve lines could be measured. All the lines are of the type 3p "--~ 3d-~3p"-~4p (3p" being the proper ground configuration of the ions). All the measured shifts are unusually large and prevailingly due to a strong specific mass effect or momentum correlation of the 3d electron with the inner p-shells. The measured shifts could be quantitatively reproduced by computation of the inherent Vinti integrals.
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