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Atomic string holography.

J C Spence1, C Koch

  • 1Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287, USA. spence@asu.edu

Physical Review Letters
|June 21, 2001
PubMed
Summary
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A novel diffraction-channeling effect causes Kikuchi patterns to form annular disks in thin crystals. This phenomenon may enable atomic-resolution lensless imaging and structure determination.

Area of Science:

  • Solid-state physics
  • Crystallography
  • Electron microscopy

Background:

  • Kikuchi patterns are formed by diffraction of high-energy beams in crystals.
  • These patterns typically appear as lines and are used for crystal orientation and phase identification.
  • Understanding beam-crystal interactions in thin films is crucial for advanced imaging techniques.

Purpose of the Study:

  • To report the discovery of a new diffraction-channeling effect.
  • To investigate the formation of annular disks from Kikuchi patterns in thin crystals.
  • To explore potential applications in atomic-resolution imaging and structure determination.

Main Methods:

  • High-energy electron, neutron, and positron beams were used to probe thin crystal samples.

Related Experiment Videos

  • Observation and analysis of the resulting Kikuchi or channeling line patterns.
  • Detection of characteristic x-ray emission as a function of diffraction conditions for electrons and positrons.

    • Main Results:

    • A novel diffraction-channeling effect was observed, causing Kikuchi patterns to break into annular disks in thin crystals.
    • These annular disks can be interpreted as Gabor in-line holograms of projected atomic strings.
    • Characteristic x-ray emission provides a low-background method for detecting these patterns with electrons or positrons.

    Conclusions:

    • The discovered diffraction-channeling effect offers a new phenomenon in beam-crystal interactions.
    • The formation of holographic disk patterns suggests potential for lensless atomic imaging.
    • This effect could be utilized for advanced materials characterization and structure determination at the atomic scale.