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The Electron Spin Resonance (ESR) of diluted Er 3þ magnetic ions in Au nanoparticles (NPs) is reported. The NPs were synthesized by reducing chloro triphenyl-phosphine gold(I) and erbium(III) trifluoroacetate. The Er 3þ g-value along with the observed hyperfine splitting indicate that the Er 3þ impurities are in a local cubic symmetry. Furthermore, the Er 3þ ESR spectra show that the exchange interaction between the 4f and the conduction electrons (ce) is absent or negligible in Au 1-x Er xdoi:10.1063/1.4867126 fatcat:pwmana2bergrllzrbh2tyghmom