ELECTRIC QUADRUPOLE SPLITTING AND THE NUCLEAR VOLUME EFFECT IN THE IONIC COMPOUNDS OF IRON 57. Technical Report No. 2
Technical Report
·
OSTI ID:4820748
Mossbauer spectra were observed in a number of divalent and trivalent Fe/ sup 57/ ionic compounds at temperatures ranging from 77 to 300 deg K. Relative energy shifts of the spectra, characteristic of the particular type of iron ion under investigation, indicate that the charge radius of the Fe/sup 57/ 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 3d/sup 7/4s/suip 1/. In addition, the ferrous data clearly show pure electric quadrupole splitting. To interpret the data quantitatively, Sternheimer polarization factors for the ferrous ion are computed and the quadrupole moment for the first excited state of Fe/sup 57/ is estimated to be 0.15 barn. A simple model is also suggested to explain the striking temperature dependence of the quadrupole splitting in the ferrous compounds. (auth)
- Research Organization:
- Carnegie Inst. of Tech., Pittsburgh
- NSA Number:
- NSA-16-023713
- OSTI ID:
- 4820748
- Report Number(s):
- NP-11788
- Country of Publication:
- United States
- Language:
- English
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