Rutherford backscattering (RBS) measurements are reported of the mosaic structure of vacuum deposited, thermally grown crystals of 1hyphen;mgr;mhyphen;thicklcub;100rcub; on MgO substrates. RBS 100gsim; axail minimum yields were found at 2 MeV on assorted mosaic spread crystals to assess their quality for channeling and blocking effect investigations. Three different mosaic spreads of 9.6, 13.4, and 16.8 min, as determined by xhyphen;ray reflection full widths at half maximum over Bragg reflection, were selected. Minimum yields were found to have a linear dependence on mosaic spread at room temperature, having a cutoff value equal to Lindhardrsquo;s theoretical estimate. The empirical relationship Dgr;Vthgr;0= (3.7khgr;minminus;6.12) min provides a criteria of characterization of ideal thin lcub;100rcub; Mo crystals for channeling purposes and also permits using the technique to identify faulted and unfaulted crystals.
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