Localization effects on quantification in axial and planar ALCHEMI

John Spence, M. Kuwabara, Y. Kim

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The effects of wave-function dimensionality and inelastic localization on ALCHEMI (Atom Location by Channeling-Enhanced Microanalysis) are studied. The original ALCHEMI equations are shown to hold for the case of partially delocalized excitations, provided that the thickness-averaged dynamical electron wavefield varies slowly over the localization volume. Experimental and theoretical comparisons of electron channeling in GaAs show that characteristic X-ray emission intensities in the axial orientation are more sensitive to variations in X-ray energy than are those in the planar (systematics) geometry. The effects of variations in localization are elucidated in a two-beam analysis, and methods for extending ALCHEMI to low-energy X-ray emission are discussed.

Original languageEnglish (US)
Pages (from-to)103-112
Number of pages10
Issue number1-2
StatePublished - 1988

ASJC Scopus subject areas

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


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