Abstract
By means of single- and double-crystal spectrometers, the integrated and the percent reflectivities and the halfwidth of the KAP, NaAP, RbAP, and NH(4)AP crystals have been measured in several orders within the (0.147-1.76-nm) spectral range. The reflection plane for all crystals is the 001 plane, which is also the cleavage plane. Among the selected crystals RbAP shows the highest reflectivity. Comparison with the theory leads in a first approximation to the conclusion that all these crystals are of nearly perfect and not of a mosaiclike structure.
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