Abstract
X-ray diffraction measurements of the crystal truncation rod (CTR) scattering show that the cleavage surfaces of ionic crystals such as NaCl(001) and KBr(001) are divided into several small flat surface regions with normal directions close to the [001] direction but differing slightly from each other like for a mosaic crystal. From the analysis of the intensity distribution of the CTR scattering, the c-axis lattice spacings of the top surface layers of the vacuum-cleaved crystals were found to shrink by about 3% and 6% relative to the bulk lattice spacings for NaCl(001) and KBr(001), respectively.
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