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Mo-based multilayers show high reflectivities in the 8 - 20 nm region at normal incidence. We have evaluated the soft x-ray reflectivities and the effects of thermal annealing on both reflectivity and the layered structures of these Mo-based multilayers. The Cu-K (alpha) x-ray first-order Bragg-peak reflectivity of the Mo/Si multilayer markedly decreases at annealing temperatures above 400 degree(s)C. TEM observation reveals that the thermally induced deteriorations of Mo/B4C and Mo/SiC multilayers are smaller than those of the Mo/Si multilayer. The Mo/Si multilayer reflectivity at a wavelength of about 13 nm decreases greatly with 600 degree(s)C annealing. However, the Mo/B4C and Mo/SiC multilayers maintain higher reflectivities at the same wavelength. These results suggests that the Mo/B4C and Mo/SiC multilayers are superior to a Mo/Si multilayer in terms of thermal stability.
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