Photoemission Energy Distributions for Au from 10 to 40 eV Using Synchrotron Radiation

High-resolution (typically 0.15 eV) electron energy distributions are reported for Au at closely spaced intervals of photon energy in the 10- to 40-eV range. The data show much $d$-band structure which continuously varies in energy position and amplitude as the photon energy is varied, thereby indicating conservation of crystal momentum over the entire measured range. An experimental density of states for Au has been determined from the data by averaging over all photon energies using a modified $f$-sum rule for photoemission.