Bloch-Wave Analysis in Electron Diffraction Experiments with a CaF2 Single-Crystal Wedge

K. Ishida, A. W. S. Johnson, G. Lehmpfuhl

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Abstract

The fine-structure spots in an electron diffraction pattern from a crystal wedge represent the strong partial waves of strongly excited Bloch waves. Diffraction experiments near the [100] and the [110] zone axes of a CaF2 crystal were carried out in order to determine from a fine-structure profile analysis the low-indexed structure potentials V111, V200 and V220and the absorption coefficients of different Bloch waves. Under these experimental conditions there exist three strong Bloch waves; one is concentrated at the rows of Ca atoms, another along the rows of F atoms and a third is concentrated in the space between the atom rows. The absorption coefficients depend in a characteristic way on the density of atoms along the atom rows. This density is different for the two projections leading to different absorption coefficients. A strong background due to inelastic scattering was observed mainly in one strong reflection which was supposed to be due to phonon excitation.

Original languageEnglish
Pages (from-to)1715-1729
Number of pages15
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume30
Issue number12
DOIs
Publication statusPublished - 1 Dec 1975
Externally publishedYes

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