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Many‐Beam Diffraction Effects in Gold and Measurement of Absorption Parameters by Fitting Computer‐Graphs
Author(s) -
Steeds J. W.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700380119
Subject(s) - channelling , scattering , diffraction , beam (structure) , absorption (acoustics) , computational physics , electron , optics , spring (device) , physics , atomic physics , materials science , nuclear physics , ion , quantum mechanics , thermodynamics
A computer simulation of electron micrographs has been described previously (Spring and Steeds [1]). The method is here applied to the case of gold where many‐beam effects become important. Measurement of the absorption parameters are made at 600 and 100 keV for the hhh systematics and compared with predicted values. The comparison of computer simulated and experimental bend contours shows agreement only when the atomic scattering potential is also carefully chosen. A simple classification of bend contours is made using both cross‐hatching effects and also central channelling and realised theoretically through analytic four‐beam theory. The change of channelling properties with accelerating voltage is discussed.