Abstract
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 language | English (US) |
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Pages (from-to) | 103-112 |
Number of pages | 10 |
Journal | Ultramicroscopy |
Volume | 26 |
Issue number | 1-2 |
DOIs | |
State | Published - 1988 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Instrumentation