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- W2094702350 abstract "The dependence of the fringe spacing of extinction contours on crystal orientation has been studied in bright-field images of wedge crystals of silicon. Crystal orientations were chosen so that either the (111) or (220) set of systematic reflections was excited. Comparison of the results obtained with extinction contours in (111) and (220) dark-field images shows that when effects of systematic reflections are weak, as in the (220) case, there are no significant differences between bright-and dark-field contours. When effects of systematic reflections are strong however, as in the (111) case, bright- and dark-field extinction contours are markedly different. Thus, for example, at certain crystal orientations the brightfield intensity profiles show the complex structure characteristic of the effects of multiple reflections whereas the dark-field images, for the same diffracting conditions, are two-beam in character.An keilformigen Siliziumkristallen wurde die Abhangigkeit der Streifenabstande der Extinktionskonturen von der Kristallorientierung an Hellfeldbildern untersucht. Die Kristallorientierungen wurden so gewahlt, das entweder der (111)- oder der (220)-Satz der systematischen Reflexionen angeregt wurde. Ein Vergleich der mit Extinktionskonturen in (111)- und (220)-Dunkelfeldbildern erhaltenen Ergebnisse zeigt, das, wenn die Einflusse systematischer Reflexionen schwach sind, wie im (220)-Fall, keine bedeutenden Unterschiede zwischen Hell- und Dunkelfeldkonturen vorhanden sind. Wenn die Einflusse systematischer Reflexionen jedoch starker — wie im (111)-Fall — sind, so sind die Hell- und Dunkelfeld-extinktionskonturen merklich unterschiedlich. So zeigen z. B. die Hellfeldintensitatsprofile bei gewissen Kristallorientierungen die komplexe Struktur, die fur Effekte von Mehrfachreflexionen charakteristisch ist, wahrend die Dunkelfeldbilder fur dieselben Beugungsbedingungen Zweistrahlcharakter haben." @default.
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- W2094702350 title "A Comparison of the Effects of Systematic Reflections on Extinction Contours in Bright- and Dark-Field Images of Wedge Crystals" @default.
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- W2094702350 doi "https://doi.org/10.1002/pssb.19700370219" @default.
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