Grazing incidence X-ray reflectivity - Studies for the AXAF observatory

Details Grazing incidence X-ray reflectivity - Studies for the AXAF observatory Grazing incidence X-ray reflectivity - Studies for the AXAF observatory

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1546...26s&link_type=abstract

In: Multilayer and grazing incidence X-ray/EUV optics; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39658 15

Astronomy and Astrophysics

Astrophysics

Grazing Incidence, Optical Reflection, X Ray Astrophysics Facility, Density Measurement, Optical Properties, Surface Roughness Effects

Scientific paper

The energy bandwidth and total throughput of a grazing incidence optics system is a strong function of the X-ray reflectivity of the surface coating. In support of the Advanced X-ray Astrophysics Facility (AXAF), studies are underway to evaluate and characterize the reflectivity of potential AXAF coatings. Here we report on results obtained for Au, Ir, and Ni coatings produced by electron-beam evaporation, evaporation with ion-assist, and sputtering. Effects of coating thickness and deposition angle have been evaluated at 6.4 and 8.1 keV; the highest reflectivities are those of the thinner, about 200 A vs about 700 A, coatings. While considerable variations exist, the best Ir samples have higher reflectivity than any of the Au coatings. Data results have been compared with models for theoretical reflectivity, particularly with regard to the effective density of the coatings. Independent measurements of the coating densities have been carried out for comparison with the reflectivity results.

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