Abstract
The methods used by Kambe to treat nonsystematic three-beam interaction have been extended to a more general case, in which there are two groups of reflections, gi (i = 1..n) and hi (i = 1..m). Each reflection has strong interactions with reflections in its own group and weak interactions with reflections in another group. ThusPractical cases of interest are (i) parallel rows of reflections in the ZOLZ and (ii) HOLZ and ZOLZ groups. In the following we will develop an approximate intensity expression for reflections, hi, with weak coupling to the incident beam. We assign g1 = 0 as the incident beam. This intensity expression can be used to describe the intensity distribution in CBED disks of nonsystematic reflections for cases (i) and (ii) above.Many-beam dynamical electron diffraction in RHEED with reflections gi and hi is described by
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