Ultraviolet photoelectron spectra taken with 40.81-eV photons are presented for three series of Au alloys: AuGa, AuIn, and AuCd. The results are discussed with reference to similar work on a series of Ag alloys previously reported and are also compared with x-ray photoelectron spectroscopy data. The results are consistent with the previous work on Ag alloys in that the Au $5d$ doublet width and splitting are (i) independent of the secondary or alloying metal, and (ii) strongly dependent on the mean number of nearest Au neighbors. The behavior of the Au $5d$-band width, as a function of Au concentration, as measured here using Heii radiation, differs significantly from that measured previously using x-ray photoelectron spectroscopy. This difference cannot be attributed wholly to the difference in linewidth of the two-photon sources or to surface enrichment of the samples. The similar variations of the Ga, In, and Cd $d$ bands as a function of Au concentration are discussed with reference to previous work on the alloys of AgIn and AgCd.

• Received 10 March 1977

DOI:https://doi.org/10.1103/PhysRevB.18.2561