Effect of Crystal Defects On Microdiffraction Patterns
Effect of Crystal Defects On Microdiffraction Patterns
Warren, John Beverly
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In Cowley and Smith's paper, a convergent beam was used to produce a channeling pattern such as the ones shown in Fig. 3.5. Cowley and Smith discovered that by de- focusing the convergent beam such that the cross-over does not coincide with the specimen plane, each excess and deficit channel line pair can be split into two dis- tinct lines, where the width of the splitting is governed by the amount of defocus. Examples of the line splitting effect for a par- ticular channel line pair are marked... by arrows in Fig. 3.5b and c. The explanation for the effect is shown in Figs. 3.6 and 3.7, which have been reproduced from Cowley and Smith's paper. Consider the incident and diffracted rays from opposite sides of the convergent cone for perfect crystal (Fig. 3.6). For this case, the incident rays that lie at the proper angle for Bragg dif- fraction are parallel to the scattered rays produced by the rays on the opposite of the cone. For the case of a bent crystal, shown in Fig. 3.7, this is no longer true.
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