Evidence for Quadrupole Interaction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn><mml:mn>7</mml:mn><mml:mi>m</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>, and Influence of Chemical Binding on Nuclear Gamma-Ray Energy

The recoil-free emission and resonant absorption (Mossbauer effect) of the 14.4-kev gamma ray of Fe/sup 57/ were used to determine the quadrupole coupling for the 3/2-excited state of Fe/sup 57/ bound in Fe/sub 2/O/sub 3/, and to measure the energy shift of the gamma ray. The internal magnetic field at the Fe/sup 57/ nucleus bound in Fe/sub 2/O/sub 3/ was also measured. The source was Co/sup 57/ plated onto stainless steel (Cr 25%, Ni 20%), and the absorber was Fe/ sub 2/O/sub 3/ enriched approximately 30% in Fe/sup 57/; both were kept at 25 deg C during experiments. The results give an indication of a small quadrupole moment for Fe/sup 57m/ snd an energy shift of 1.26 plus or minus 0.15 x 10/sup - 8/ ev between stainless steel and Fe/sub 2/O/sub 3/. An internal magnetic field of 5.15 x 10/sup5/ gauss is calculated for Fe/sup 57/ in Fe/sub 2/O/sub 3/. Diff erences in the chemical environment which could have caused the energy shift are discussed. The importance of having both the source and absorber identical chemically for Mossbauer effect studies is stressed. (D.L.C.)

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