Interpretation of Mössbauer Measurements in Tin and Antimony

Using the M\"ossbauer effect in Sb¹²¹, measurements of the isomeric shift and quadrupole splitting have been made in a variety of antimony compounds. This data, along with similar results in Sn¹¹⁹ by earlier authors, have been interpreted using Hartree---Fock self-consistent-field atomic wave functions. New values are: (δrr) (Sn¹¹⁹)=(1.2±0.4)×10^-4, Q(Sn¹¹⁹)=(-0.06±0.02) b, (δrr) (Sb¹²¹)=(-8.5±3.0)×10^-4, and Q(Sb¹²¹5/2⁺)=(-0.26±0.1) b. The interpretation for Sn extends the work of Shpinel, Boyle, and Flinn; the result (δrr) (Sn¹¹⁹)>0 is opposite to a conclusion recently reached by Gol'danskii. The value for (δrr) (Sb¹²¹) is much larger than that anticipated by a simple nuclear model.