Laser spectroscopic measurement of isotope shifts of transitions 3d-4p in the ionic spectra of argon, chlorine and sulphur

By means of collinear laser spectroscopy at ion beams of Ar+, S+ and Cl+ the isotope shifts of a total of twelve lines could be measured. All the lines are of the type 3psup(n-1)3d→3psup(n-1)4p (3psup(n) 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. (orig.)