MOSSBAUER EFFECT IN TIN COMPOUNDS - INTERPRETATION OF ISOMER SHIFTS AND DETERMINATION OF NUCLEAR RADIUS CHANGE IN 119SN

An interpretation of the isomer shift of 119mSn in its two ionic states [ (2+) and (4+) ] and its one covalent (sp3) state is presented. Based on the values of the isomer shifts of the ideal configuration of +2.86 mm/sec for Sn(2+), -2.36 mm/sec for Sn(4+), and -0.075 mm/sec for Sn(2+) all relative to Mg2Sn (77°K) and a Liberman-Waber-Cromer relativistic wavefunction calcuktion, a value of δR/R=+9.21×10-5 is obtained. In addition, a calibration for the corresponding shift due to a single 5s electron, 3.06 mm/sec, the 5s-5s screening effects, -0.20 mm/sec, the 5s-5p screening effects, -0.09 mm/sec, and the inner-shell screening due to the 5s electron, -0.05 mm/sec is given.