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

129 Citations (Scopus)

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 - 1993

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Holograms
wedges
Crystals
Reflection high energy electron diffraction
Phase measurement
Electrons
magnification
Interferometry
Crystal orientation
high energy electrons
crystals
interferometry
electrons
electron diffraction
recording
Calibration
Defects
causes
defects
Chemical analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation

Cite this

Accurate measurements of mean inner potential of crystal wedges using digital electron holograms. / Gajdardziska-Josifovska, M.; McCartney, Martha; de Ruijter, W. J.; Smith, David; Weiss, J. K.; Zuo, J. M.

In: Ultramicroscopy, Vol. 50, No. 3, 1993, p. 285-299.

Research output: Contribution to journalArticle

Gajdardziska-Josifovska, M. ; McCartney, Martha ; de Ruijter, W. J. ; Smith, David ; Weiss, J. K. ; Zuo, J. M. / Accurate measurements of mean inner potential of crystal wedges using digital electron holograms. In: Ultramicroscopy. 1993 ; Vol. 50, No. 3. pp. 285-299.
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AU - Weiss, J. K.

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