Atomically Resolved Images from Near Node Photoelectron Holography Experiments on Al(111)

Szöke's concept for electron holography is hampered by forward scattering that dominates electron diffraction from electron point sources below the surface top layer. Forward scattering was proposed to be suppressed if the anisotropic nature of the electron source wave is exploited [T. Greber and J. Osterwalder, Chem. Phys. Lett. 256, 653 (1996)]. Experiments show a strong suppression of forward scattering in Al(111) if Al $2s$ photoelectrons $(E_{\mathrm{kin}}=952\mathrm{}\mathrm{eV})$ are measured near the nodal plane of the outgoing $p$ wave. The holographic reconstruction from such diffraction data provides three dimensional images of atomic sites in unit cells with a size of more than 10 Å.