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ALCHEMI as holography

Published online by Cambridge University Press:  02 July 2020

J.C.H. Spence  and
C. Koch
J.C.H. Spence
Affiliation:
Physics Department, Arizona State University, Tempe, Az. 85287 - 1504. USA. [email protected]
C. Koch
Affiliation:
Physics Department, Arizona State University, Tempe, Az. 85287 - 1504. USA. [email protected]
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Abstract

Two-dimensional Atom Location by Chanelling Enhanced Microanalysis ( Alchemi ) maps of characteristic Xray emission as function of the diffraction conditions of a 200kV electron beam hav been obtained from thin crystals by several workers . Reciprocity shows that these are equivalent to the diffraction patterns produced at infinity by 200kV point sources of electrons on atom sites, sue! as D in figure 1, for CsCl. Here ray SCD at left has been time-reversed at right. Using multislici superlattice simulations which launch a spherical wave from an atom site, we find that the resultinj Kikuchi pattern breaks up into separated blobs along the K-lines at small thickness, with one blol generated at infinity along each atomic string direction . Each blob (e.g. ID) is a Gabor in-lim hologram (e.g of atom C, formed by source S at right). Each source atom on equivalent sites (E, D produces identical holograms, whose intensities add.

Type
Atom Location by Channeling Enhancement of X-Ray and EELS Signals (ALCHEMI)(organized by J.Spence)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 350 - 351
Copyright
Copyright © Microscopy Society of America 2001

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References

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6 Supported by NSF award DMR9814055.Google Scholar