On the correspondence between cathodoluminescence images and X-ray diffraction contrast images of individual dislocations in diamond

A one-to-one correspondence has been demonstrated between dislocation lines outcropping at or lying not deeper than circa 20 μm below the specimen surface, as mapped by X-ray topography, and lines emitting a characteristic linearly polarized blue cathodoluminescence which can be seen in regions unusually sparsely populated by other defects giving rise to visible cathodoluminescence upon excitation by electrons in the energy range 10 to 50 kV.