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Photoelectron holography of Pb/Si(111)-( X v -)R30°-fl

The technique of holographic image reconstruction based on photoelectron detection has been applied to the Pb/Si(111)(v~x v~)R30°-/3 phase for a determination of the surface structure. Angle-resolved photoemission from the Pb5d core level shows intensity oscillations as a function of photon energy. These constant-initial-state spectra were taken at various emission angles and Fourier inverted to yield three-dimensional real-space images of the nearest neighbors to the emitter atom. These images clearly show Pb atoms adsorbed at the T 4 site.