Charge transfer in CsCl-structure intermetallic compounds

Core-electron binding-energy shifts of CuZn, AgCd, AuZn, and AuMg, and Mössbauer-effect ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ isomer shifts of AuZn, AuMg, AuRb, and AuCs are presented. X-ray-photoemission valence-band spectra are interpreted as showing that there is a tendency to fill the $d$ states of metallic gold when compounds are formed with Zn, Mg, and Cs. A consistent interpretation of the change transfer on alloy formation is obtained by postulating charge flow from states with $6p$ character in Au metal to $5d$ and $6s$ states in the intermetallic compounds.