Indexing Electron Diffraction Patterns
AimsBefore you startIntroductionMathematics relating the real space to the electron diffraction patternLaue zonesKikuchi linesUsing polycrystalline materials in the TEMConvergent beam electron diffraction (CBED)Using other methods in conjunction with electron diffractionSummaryQuestionsGoing furtherTLP creditsTLP contentsShow all contentViewing and downloading resourcesAbout the TLPsTerms of useFeedbackCredits Print this page
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Example of indexing with an unknown electron beam orientation
If φ were 72.5° and we were to measure the ratio x/y and find it to be numerically equal to 1.66 then we could be reasonably convinced that the dot at Y could be labelled as the 200 spot, and the dot at X could be labelled as 113. In this case our predicted electron beam direction is in the direction common to the 200 and 113 planes, i.e. [03]. This particular electron diffraction pattern has a central rectangular repeat. If this is correct, further spots on this diffraction pattern can be indexed in a self-consistent manner by vector addition.