Abstract
AbstractThe instrument smearing function of a two‐crystal spectrometer in the (n, n) position having negligible vertical divergence has been calculated for an unpolarized incident beam assuming the crystals to be centro‐symmetric and to reflect according to the Prins‐Darwin theory. The results are given in terms of the parameters g and s̀ which describe the ‘overall absorption’ and the imaginary part of the structure factor, respectively. In the region g, s̀ σ ≤ 0.5 asymmetries of up to 60% are found in the smearing function. Variations of several tens of per cent occur in the half‐breadth as compared with the breadth obtained for a σ polarized beam with no absorption.In order to avoid the undesirable effects of absorption, silicon (111) crystals should not be used above wavelengths 3 to 4 Å. Suitable wavelengths for calcite (211) crystals are 3.07 to 6 Å.
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