Calibration of the isomer shift of125Te from internal conversion and mössbauer measurement

First principles calculation of Mössbauer isomer shift

“…Calibration constants˛and fractional charge radii R/R for several Mössbauer nuclei are collected in Table 3 [107][108][109][110][111][112]. In determination of these parameters, the results of quantum chemical calculations of the contact densities (0) or partial contact densities n k (0) have been used in the interpretation of Mössbauer and internal conversion experiments.…”

Moessbauer spectroscopy

“…Dezsi et al (297) presented further evidence for the formation of natural chemical bonds of 129I resulting from 129mTe implanted in Ge and a-GeTe. Miura et al (298) paired Mossbauer spectroscopy with internal conversion measurements for a study of radioactive 125I implanted into seven different metal matrices. A value of AR/R for the 35.46-keV Ml transition of 125Te was derived that is slightly larger than previous experimental values but which agrees well with theory.…”

Calibration and interpretation of Mössbauer isomer shift of the 81-keV transition in133Cs

“…The theoretical calculations of electron contact densities for free atoms and ions are reasonably reliable for the inner shells, but they are of doubtful significance for the outermost shells of atoms in a solid from which the largest contributions to the isomer shift are expected to arise; therefore, it is important to obtain more direct experimental information about ⌬(0). During the last decade, determinations of the ⌬R/R values for 119 Sn and 125 Te have been carried out by the present authors using the internal conversion method, 9,10 which is a unique method that combines the isomer shifts obtained from Mössbauer measurements with measurements of the influence of the chemical environment on internal conversion probabilities for the same sample. Thus, the present paper describes a determination of ⌬R/R in the 81-keV (M 1 ϩ2.8%E2) transition of 133 Cs by the internal conversion method, and also using the calibration constant thus obtained, a quantitative interpretation of the isomer shift of 133 Cs focusing on the large shifts observed in metallic matrices.…”