High-reflectance magnetron-sputtered scandium-based x-ray multilayer mirrors for the water window.

Title High-reflectance magnetron-sputtered scandium-based x-ray multilayer mirrors for the water window.
Authors C. Burcklen; S. de Rossi; E. Meltchakov; D. Dennetière; B. Capitanio; F. Polack; F. Delmotte
Journal Opt Lett
DOI 10.1364/OL.42.001927
Abstract

We present an experimental comparison of several Sc-based short period multilayer mirrors including Cr/Sc with B4C barrier layers and CrNx/Sc, and we propose a new material combination that provides high reflectance in the water window domain. Multilayer samples with period thickness in the range 1.5-1.7 nm have been deposited by magnetron sputtering and characterized by x-ray reflectometry with a Cu-K? source and with synchrotron radiation near the Sc-L2,3 edge. Best results are achieved by combining the nitridation of Cr layers and the addition of B4C barrier layers. Near normal incidence reflectance as high as 23% has been measured at photon energy of 397 eV. A simulation model of the multilayer structure is proposed and it predicts that reflectance higher than 32% is achievable with CrNx/B4C/Sc mirrors.

Citation C. Burcklen; S. de Rossi; E. Meltchakov; D. Dennetière; B. Capitanio; F. Polack; F. Delmotte.High-reflectance magnetron-sputtered scandium-based x-ray multilayer mirrors for the water window.. Opt Lett. 2017;42(10):19271930. doi:10.1364/OL.42.001927

Related Elements

Scandium

See more Scandium products. Scandium (atomic symbol: Sc, atomic number: 21) is a Block D, Group 3, Period 4 element with an atomic weight of 44.955912. The number of electrons in each of Scandium's shells is [2, 8, 9, 2] and its electron configuration is [Ar] 3d1 4s2. Scandium Bohr Model The scandium atom has a radius of 162 pm and a Van der Waals radius of 216 pm.Scandium was predicted by Dmitri Mendeleev in 1871 and actually discovered and isolated by Lars Nilson in 1879. One of the transition metals, scandium has a silvery-white appearance in its elemental form which oxidizes to yellow or pinkish upon contact with air. Elemental ScandiumIt is occasionally included in the classification of the rare earth elements. Scandium is found in concentrated amounts in the minerals euxenite, gadolinite and thortveitite however, due to the difficulties in the preparation of metallic scandium, global trade of the pure metal is very limited. The origin of the name scandium comes from the Latin word 'scandia' meaning Scandinavia.

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