Sensitivity and accuracy of CBED pattern-matching

DM BIRD, M SAUNDERS

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

When establishing the feasibility of matching experimental and theoretical convergent-beam electron diffraction (CBED) patterns to recover structure-factor information it is important to investigate the accuracy of the results obtained and the effects of random and systematic errors. The effects of counting noise in a digital data-collection system are studied, together with various sources of systematic error. The sensitivity of parts of the pattern to specific structure-factor parameters is analysed via the calculation of analytic gradients of the intensity with respect to those parameters. All calculations are based on diffraction at the [110] axis of GaP, using simulated CBED patterns as idealised "experimental" data. The results indicate that, provided care is taken to minimise the effects of systematic errors, low-order structure factors may be extracted from experimental data with an accuracy approaching 0.1%.

Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalUltramicroscopy
Volume45
Issue number2
DOIs
Publication statusPublished - Sep 1992
Externally publishedYes

Cite this

BIRD, DM ; SAUNDERS, M. / Sensitivity and accuracy of CBED pattern-matching. In: Ultramicroscopy. 1992 ; Vol. 45, No. 2. pp. 241-251.
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Sensitivity and accuracy of CBED pattern-matching. / BIRD, DM; SAUNDERS, M.

In: Ultramicroscopy, Vol. 45, No. 2, 09.1992, p. 241-251.

Research output: Contribution to journalArticle

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AU - BIRD, DM

AU - SAUNDERS, M

PY - 1992/9

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AB - When establishing the feasibility of matching experimental and theoretical convergent-beam electron diffraction (CBED) patterns to recover structure-factor information it is important to investigate the accuracy of the results obtained and the effects of random and systematic errors. The effects of counting noise in a digital data-collection system are studied, together with various sources of systematic error. The sensitivity of parts of the pattern to specific structure-factor parameters is analysed via the calculation of analytic gradients of the intensity with respect to those parameters. All calculations are based on diffraction at the [110] axis of GaP, using simulated CBED patterns as idealised "experimental" data. The results indicate that, provided care is taken to minimise the effects of systematic errors, low-order structure factors may be extracted from experimental data with an accuracy approaching 0.1%.

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