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Direct atomic imaging of Ag(100) and Ag(111) by inverting quasielastically scattered electron-diffraction patterns
Phys. Rev. B 51, 13645 – Published 15 May, 1995
DOI: https://doi.org/10.1103/PhysRevB.51.13645
Abstract
Direct imaging of three-dimensional atomic structure of Ag(100) and Ag(111) surfaces by Fourier-transforming the multiple-energy diffraction patterns of quasielastically scattered electrons is demonstrated experimentally. The holographic images obtained with an integral-energy phase-summing method are of high fidelity and free from artifacts. The resolution of the atomic images is ∼1 Å in all spatial directions. The atoms down to three layers below the emitters are three dimensionally imaged. The contribution from backward-scattering and forward-scattering oscillations can be separately observed by varying the energy range used in Fourier transformation. The surface sensitivity can be enhanced by using an off-normal-incident geometry. With a limited energy range (∼200 eV) used in Fourier transformation, the atoms behind the emitter in the backward direction are observed.
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