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Improved quantitative CBED structure‐factor measurement by refinement of nonlinear geometric distortion corrections
Author(s) -
Nakashima Philip N. H.
Publication year - 2005
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889805003900
Subject(s) - distortion (music) , benchmark (surveying) , work (physics) , diffraction , electron diffraction , structure factor , computational physics , density functional theory , nonlinear system , physics , mathematics , mathematical analysis , optics , condensed matter physics , quantum mechanics , amplifier , optoelectronics , geodesy , cmos , geography
A new method that accounts for small but significant geometric distortions in quantitative convergent beam electron diffraction (QCBED) is briefly introduced. A summary of preliminary results obtained with this method shows an average three‐ to fourfold improvement in structure‐factor measurement precision by QCBED. In the present work this method is applied to α‐, a benchmark compound for charge density studies. Experimental uncertainty is reduced to a level three times smaller than differences between density functional theory and periodic Hartree–Fock calculated structure factors.