Boron based X-ray multilayer mirrors for the spectral range 6.7–9 nm

The paper presents the results of a study of the reflective characteristics and structural parameters of multilayer X-ray mirrors based on a pair of Ru/B$_4$C materials, optimized for the spectral range 67–90 $\mathring{\mathrm{A}}$. A comparison of these structures with Mo/B$_4$C and La/B$_4$C mirrors is presented.