Smertin, R.M.; Garakhin, S.A.; Zuev, S.Yu.; Nechai, A.N.; Polkovnikov, V.N.; Salashchenko, N.N.; Svechnikov, M.V.; Sertsu, M.G.; Sokolov, A.; Chkhalo, N.I.; Schäfers, F.; Yunin, P.A.: Influence of Thermal Annealing on the Properties of Multilayer Mo/Be Mirrors. Technical Physics 64 (2019), p. 1692-1697
10.1134/S1063784219110252

Abstract:
he influence of thermal action on X-ray optics performance and structure of films and transition regions in multilayer Mo/Be mirrors optimized for a reflection maximum in the interval 11.2–11.4 nm at normal incidence has been considered. The annealing temperature reached 300°C and the annealing time was 1 and 4 h. It has been shown that after thermal annealing in vacuum for 1 h at 300°C, the reflection coefficient rises; however, when the annealing time grows to 4 h, it drops. Grains in molybdenum films become finer, and the profiles of transition regions change from exponential to linear. The period of multilayer mirrors has remained the same under all annealing conditions.