Charge Screening of Impurities in Gold Observed by the Mössbauer Isomer Shift

Abstract
The isomer shift of Au197 in Au-Hg alloys containing up to 12% Hg has been measured. The change produced by the Hg is extremely small, five times smaller than that produced by any solute studied previously. This result is compared with those in other gold alloys and compounds. A microscopic theoretical calculation based on a partial-wave model is successful in explaining this anomaly.