Spectrometric properties of crystals for X-ray astronomy. I

Preliminary results are reported on measurements of X-ray reflection coefficients, rocking-curve width estimates, and factors that influence these for KAP, EDDT, and ADP crystals. The agreement between parameters measured in the authors' laboratory and others over a period of some ten years, and the uniformity among the authors' samples, indicate that KAP as commercially supplied is amenable to a single theoretical description. This permits application of X-ray diffraction theory, which outlined and compared to measurements with good agreement.