Mossbauer spectroscopy of Tin compounds
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Date
1985
Authors
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Publisher
Obafemi Awolowo University
Abstract
The Mossbauer spectrometer has been used in the transmission geometry to measure the isomer
shifts and quadrupole splitting of tin and some of its inorganic compounds. The spectrometer has
a Moire interferometer for absolute velocity calibration and the velocity data are fitted to a
polynomial by the method of least squares. As a check on the velocity calibration, a natural iron
foil absorber has been used. The ratio of the g-factors extracted from the iron data is in
agreement with published values.
The Mossbauer spectral data has been fitted with a sum of Lorentzians and the isomer shift and
quadrupole splitting values obtained from these fits are in good agreement with published ones.
Using s-electron densities Calculated from relativistic Hartree-Fock method for the various
oxidation states of tin the fractional change in nuclear charge radius ΔR/R following a gamma
transition has been calculated as (+2.05 ± 0.17) x 10-4. This is in good agreement with published
values.
From molecular orbital calculations, a configuration of 5s1..25p 2..8 has been suggested for α-tin.
No equivalent data exists for β-tin. However, since the isomer shift is directly proportional to the
s-electron density at the nuclear site, the measured isomer shift value has been used to suggest a
configuration of 5s1.42 5p2.8 for β-tin. This is consistent with the saner shift values for the two
allotropes of tin.
Description
92p
Keywords
Transmission, geometry, isomer, inorganic compounds, calibration, spectrometer, quadrupole, electron, gamma rays, orbital transmission, allotropes, tin
Citation
Arua, A.E. (1985). Mossbauer spectroscopy of Tin compounds. Obafemi Awolowo University