Accession Number : AD0276726

Title :   ELECTRIC QUADRUPOLE SPLITTING AND THE NUCLEAR VOLUME EFFECT IN THE IONIC COMPOUNDS OF IRON-57

Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA

Personal Author(s) : INGALLS,ROBERT L.

Report Date : 01 MAY 1962

Pagination or Media Count : 1

Abstract : Mossbauer spectra have been observed in a number of divalent and trivalent Fe57 ionic compounds at temperatures ranging from 77 K to 300 K. Relative energy shifts of the spectra, characteristic of the particular type of iron ion under investigation, indicate that the charge radius of the Fe57 nucleus is greater in the ground state than in the first excited state. These spectral shifts, when compared to that for the iron atom, indicate that the electron density at the iron nuclei in metallic iron is equivalent to the electron configuration 3d74s1. In addition, the ferrous data clearly show pure electric quadrupole splitting. To interpret quantitatively the data, the Sternheimer polarization factors for the ferrous ion are computed and the quadrupole moment for the first excited state of Fe57 is estimated to be 0.15 barns. A simple model is also suggested to explain the striking temperature dependence of the quadrupole splitting in the ferrous compounds. (Author)

Descriptors :   *IRON, *NUCLEAR FLUORESCENT SCATTERING, *NUCLEAR RESONANCE, RADIOFREQUENCY LENSES, EXCITATION, IONS, ISOTOPES, MOSSBAUER EFFECT, POLARIZATION, QUADRUPOLE MOMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE