Physics – Optics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apopt..46..185r&link_type=abstract
Applied Optics IP, vol. 46, Issue 2, pp.185-189
Physics
Optics
1
Coatings, Thin Films, Optical Properties, X-Ray Optics, X-Ray Mirrors, Astronomical Optics
Scientific paper
In connection with the design of a hard-x-ray telescope for the Constellation X-Ray Observatory we measured the reflectivity of an iridium-coated zerodur substrate as a function of angle at 55, 60, 70, and 80 keV at the National Synchrotron Light Source of Brookhaven National Laboratory. The optical constants were derived from the reflectivity data. The real component of the index of refraction is in excellent agreement with theoretical values at all four energies. However, the imaginary component, which is related to the mass attenuation coefficient, is 50% to 70% larger at 55, 60, and 70 keV than theoretical values.
Bruni Roberto
Gorenstein Paul
Romaine Suzanne
Zhong Zai-Zhe
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