Isotope Shifts and Hyperfine Structure in the Atomic Spectrum of Tin

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Abstract
The spectrum of tin was excited in a liquid oxygen cooled hollow cathode tube, and examined by means of a Fabry-Perot interferometer. With the use of highly enriched samples of tin isotopes, isotope shifts of all the even isotopes were measured in the spark line 5s26s2S1/2 - 5s26p2P3/2, λ6454. The shifts between successive even isotopes vary from 0.0015 cm-1 for 122Sn and 124Sn to 0.0067 cm-1 for 112Sn and 114Sn, and this change occurs in two `jumps'. The probable error is about 0.0002 cm-1. The corresponding isotope shift constants (C values), calculated without allowance for the specific mass shift, vary from 15 × 10-3 cm-1 to 40 × 10-3 cm-1. The hyperfine structures of the line λ6454 of the odd isotopes 117Sn and 119Sn were measured. The ratio of the splittings is 1.042, in good agreement with the value 1.046 calculated from the nuclear resonance values of the nuclear magnetic moments.

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