The clevage plane grating spacing of potassium acid phthalate (KAP) has been measured in nine orders of diffraction and d∞ found to be (13289.51±0.05 xu) at 26°C. The use of these crystals as diffraction elements for the wavelength range 6 to 25 Å is discussed. Measurement of the lattice spacing is by diffraction angle determinations in many orders with Cu Kα1 radiation. An angular precision of 0.1″ is attained. The index of refraction was calculated from the crystal constants and is consistent with the observed orders of diffraction.
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