The 4s electron densities of Fe impurity atoms in some transition and noble metals

Abstract

From internal conversion experiments and the Mössbauer effect measurements, the 4s electron density and isomer shift for Fe impurity atoms in Cr, Ni, Cu, Pt and Au metals were studied. The M and N shell conversion electron spectra of the 14.4 keV transition of⁵⁷Fe were measured using a high resolution β-ray spectrometer and analyzed using a deconvolution methods. The Mössbauer effect measurements were performed by a standard spectrometer with a moving absorber. Most of the samples showed isomer shift values consistent with the published ones.

It is concluded that the 4s electron density,$\rho _{4_S} (0)$, at the nucleus of⁵⁷Fe embedded is nearly equal in these host metals. The relation between$\rho _{4_S} (0)$ and the isomer shift indicates that$\rho _{3_S} (0)$ plays an important role in the variation of the isomer shift.