HOLOGRAPHY OF GE(111)-C(2X8) BY SURFACE CORE-LEVEL PHOTOEMISSION

Energy-extended photoelectron holography has been applied for the firs t time to image surface structure using intrinsic surface core-level s hifts. The Ge(111)-c(2 x 8) 3d core level exhibits a surface component shifted by 0.8 eV relative to the bulk. Angle-resolved photoemission from this so-called S2 component shows intensity oscillations as a fun ction of photon energy. Inversion of the data collected at many emissi on angles yields a three-dimensional image of the nearby atoms, showin g conclusively that the S2 emission is due to adatoms bonded in T-4 si tes.