Abstract
We have measured the isotope shifts (IS) of 16 transitions and the hyperfine structure (hfs) of 10 levels in singly ionized samarium (147-150,152,154Sm II) by means of collinear fast-ion-beam laser spectroscopy (FIBLAS). We have improved the technique of FIBLAS for IS measurements by using an idea proposed by Borghs et al.1 and by using an isotopically pure beam. When we add the frequency separations between isotopes in spectra recorded in parallel and antiparallel geometries, respectively, the differences in the first-order Doppler shift between accelerated ions with different masses cancel. The expression for the experimental isotope shift becomes.
© 1994 Optical Society of America
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