Abstract
Isotope shifts have been measured in the resonance lines of Cd II and SnIV using a diffraction grating and hollow cathode light sources. The following results were obtained. 116Cd, 110Cd; lambda 2144 AA (5s2S12/-5p2P32/), -70+or-10 mK, and lambda 2265 AA(5s2S12/- 5p2P12/), -66+or-5mK. 124Sn, 116Sn; lambda 1314 AA(5s2S12/-5p2P32/), -215+or-40 mK, and lambda 1437 AA(5s2S12/-5p2P12/), -134+or-9 mK. All shifts were in the opposite direction to the normal mass shift (NMS). Isotope-shift data for many alkali-like resonance lines are tabulated and discussed, and it is assumed that for these lines the specific mass shift is NMS+or-NMS. On this assumption the isotope-shift constants were estimated to be 116+or-14 mK for 116Cd, 110Cd, and 130+or-18 mK for 124Sn. 116Sn.
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