Characterization of platinum–carbon, tungsten–silicon, and tungsten–B4C multilayers

Abstract

Multilayers of Pt/C, W/Si, and W/B4C have been developed as a reflector and dispersive element to be applied to the beamline optical system of the synchrotron radiation (SR) in 1- to 20-A region. Pt/C(2d=105 A, N=10) overcoated with Pt(d=100 A) is useful in a glazing incidence optics, which makes it possible to extend the wavelength region to the shorter side at the fixed incidence angle. W/Si(2d=53 A, N=200) and W/B4C(2d=31 A, N=300) are utilized as a dispersive element of double-crystal monochromator (DXM). The second order of Bragg reflection of W/Si is matched to the first order of KAP(2d=26.6 A) crystal. The characterization of these multilayers was carried out by using characteristic x rays and monochromatized SR in 1.5–8 keV. DXM was made of a combination of W/Si and KAP and a pair of W/B4C. Multilayers are used as the first crystal to protect the damage of the crystal caused by the strong irradiation of SR. A pair of W/B4C is aimed at getting high throughput. The energy resolution of these combinations was evaluated with Na–K absorption edge of NaCl around 1.07 keV, which was a bit poor compared to a pair of beryl crystals.