Role of scattering-factor anisotropy in electron, positron, and photon holography
- Department of Physics, The University of Hong Kong, Hong Kong (China)
- Department of Physics and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201 (United States)
We have studied the angular anisotropy in the scattering factor of electrons, positrons, and photons in solids. We show that as a function of angle, the maximum number of dips in the scattering factor{close_quote}s magnitude and jumps of near {pi} in its phase are related to the angular momenta of the bound and resonance states of the potential. The effect of the scattering factor{close_quote}s anisotropy on low-energy electron and positron holographic wave-front reconstruction is discussed. Applying the variable-axis small-cone method, a good-quality reconstructed image is only possible within angular regions where the scattering factor is near isotropic. Thus the usable window for low-energy electron wave-front reconstruction is element dependent; the window size decreases as the atomic number increases. Positrons, on the other hand, are like photons and are not bound by the potential. For positrons or photons, there is no elemental dependence of the usable window and the entire backscattering regime is suitable for holographic reconstruction. We have established two rules that predict the maximum number of magnitude dips and phase jumps in the scattering factor for any element. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 662260
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 58, Issue 16; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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