Abstract
From Mössbauer spectra of the 36.2keV and 69.5keV gamma rays of189Os, isomer shifts and electric quadrupole interactions for a number of chemical compounds of osmium in the oxidation states +8, +6, +4, +3, and +2 were obtained. The results show that the dependence of the isomer shifts on the oxidation state of Os follows the general pattern established for other transition elements like Ru and Ir. A comparison of the isomer shift data with electron densities at the Os nuclei resulting from relativistic self-consistentfield calculations for free Os ions yieldsΔ 〈r2〉 [36 keV]=−2.0 · 10−3 fm2 andΔ 〈r2〉 [69 keV]=−0.13 · 10−3 fm3 for the changes of the mean-square nuclear charge radius of189Os. These values are in qualitative agreement with an interpretation of the low-energy level scheme of189Os in terms of two rotational bands.
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We wish to thank Dr. G. Schatz and the staff of the Cyclotron Laboratory of the Gesellschaft für Kernforschung, Karlsruhe, for performing the deuteron irradiations, Drs. B. Frlec, G. Thiele, and W. Preetz for making the OsF6, OsO2, and K2 [OsF6] samples available to us, and Dr. J.B. Mann for communicating to us the results of his Dirac-Fock calculations prior to publication.
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Wagner, F.E., Kucheida, D., Zahn, U. et al. Mössbauer isomer shifts and quadrupole splittings in osmium compounds. Z. Physik 266, 223–232 (1974). https://doi.org/10.1007/BF01668844
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DOI: https://doi.org/10.1007/BF01668844