]: hyperfine interaction and lattice dynamics characterization*

With nuclear forward scattering (NFS) and nuclear inelastic scattering (NIS) of synchrotron radiation on ¹⁸⁷Os nuclear, the benchmark osmium specific hyperfine interaction and thermodynamic characterization of potassium osmate, K₂[¹⁸⁷OsO₂(OH)₄], is analyzed. Nuclear forward scattering (NFS) and nuclear inelastic scattering (NIS) of synchrotron radiation by the low-lying nuclear level of ¹⁸⁷Os in K₂[¹⁸⁷OsO₂(OH)₄] was investigated. From NFS spectra the isomeric shift, and quadrupole splitting of 12.10 ± 0.05 mm/s were determined. In addition, we performed NIS spectroscopy with a 1-meV resolution and extracted the density of phonon states in the Os (VI) compound, which have been confirmed by first principle theoretical calculations. The results provide strong evidence that NFS is a reliable technique for investigation of hyperfine interactions in osmium (VI) species, and might be potentially applicable for measuring such interactions in osmium complexes of different oxidation states, including those with anticancer activity.