Photoemission of gold in the energy range 30-300 eV using synchrotron radiation

Photoemission measurements have, for the first time, been extended to photon energies between 100 and 300 eV. Results from polycrystalline gold show amplitude modulation of the $5d$ peaks in the valence band for 100<hν<200 eV. The photoionization cross section of the $4f$ electrons is mapped out in detail from threshold to 280 eV and a narrow full width at half-maximum of 0.1-0.2 eV is found. Final-state effects are found to be important for the $5p$ excitation.