Accurate measurements of mean inner potential of crystal wedges using digital electron holograms

M. Gajdardziska-Josifovska, Martha McCartney, W. J. de Ruijter, David Smith, J. K. Weiss, J. M. Zuo

Research output: Contribution to journalArticle

134 Scopus citations

Abstract

The mean inner potential of a solid is a fundamental property of the material and depends on both composition and structure. By using cleaved crystal wedges of known angle, combined with dogital recording of off-axis electron holograms and with theoretical calculations of dynamical effects, the mean inner potential of Si (9.26±0.08 V), MgO (13.01±0.08 V), GaAs (14.53±0.17 V) and PbS (17.19±0.12 V) is measured with high accuracy of about 1%. Dynamical contributions to the phase of the transmitted beam are found by Bloch wave calculations to be less than 5% when the crystal wedges are titled away from zone-axis orientations and from major Kikuchi bands. The accuracy of the present method is a factor of 3 better than previously achieved by reflection high-energy electron diffraction and electron interferometry. The major causes of uncertainty were specimen imperfections and errors in phase measurement and magnification calibration.

Original languageEnglish (US)
Pages (from-to)285-299
Number of pages15
JournalUltramicroscopy
Volume50
Issue number3
DOIs
StatePublished - Aug 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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