Local-Structure Determination at High Dilution: Internal Oxidation of 75-ppm Fe in Cu

The local atomic environment around the iron site was measured in reduced and in oxidized dilute alloys of Fe in Cu. For these measuremements a new detector was employed that extends applicability of the technique of extended x-ray-absorption fine structure to systems a hundredfold more highly dilute than those heretofore accessible. Details of the alloy study and implications for other research of the high sensitivity of this detector system are discussed.