EXPERIMENTAL FULL-SOLID-ANGLE SUBSTRATE PHOTOELECTRON-DIFFRACTION DATA AT 1-KEV ENERGIES - IMPLICATIONS FOR PHOTOELECTRON HOLOGRAPHY

Experimental photoelectron distributions of Al 2s emission above Al(001) and Pt 4f emission above Pt(110) are presented, measured over much of 2-pi solid angle at high angular resolution. These intensity maps illustrate very clearly the relative importance of various scattering processes. In addition to forward scattering along high-density atomic chains, concentration of photoelectron flux along dense atomic planes is observed. Al 2s and Pt 4f exhibit very similar intensity patterns associated with equivalent low-index directions. Holographic information about atomic positions within the nearest-neighbor shell around emitter atoms is found to be contained in circular interference fringes in the vicinity of <011> forward-scattering directions.