Abstract
The following results of optical isotope shift measurements in the line lambda 6454 AA of Sn II are reported: 112Sn-117Sn; -10.80+or-0.3, 114Sn-117Sn; -6.27+or-0.3, 115Sn-124Sn; -17.91+or-0.4, all in mk. High resolution was provided by a pressure-scanned Fabry-Perot etalon with digital recording and analysis of data. These measurements complement results already published so that the relative positions of all the stable isotopes of tin have now been determined by this technique. 115Sn shows staggering similar to that of 117Sn and 119Sn; the shift 112Sn-114Sn does not follow the smooth trend apparent in the other even-even shifts. The changes in mean square radius of the proton distribution between successive isotopes are obtained from the data.
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