Abstract
Experimental target-current-spectroscopy (TCS) data of iridium and platinum are presented for the unreconstructed and the reconstructed (100) surface modifications. The effects of reconstruction on the coupling of free electrons to bulk bands are discussed with reference to a fully relativistic bulk-band-structure calculation. A TCS-based method for absolute work-function determinations is presented. For the unreconstructed (100) surfaces of iridium and platinum we obtain ${\mathrm{\ensuremath{\Phi}}}_{1}$=6.1\ifmmode\pm\else\textpm\fi{}0.1 eV and ${\mathrm{\ensuremath{\Phi}}}_{2}$=5.5\ifmmode\pm\else\textpm\fi{}0.2 eV, respectively. Reconstruction-induced changes of the work function amount to -0.1 eV for platinum and -0.2 eV for iridium.
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