Abstract
A highly polished platinum coated mirror was demonstrated to reflect X-rays with high efficiency up to 38 keV (0.33 Å). For the mirror operating at an angle of incidence of 8 mrad, the mirror reflected 8 keV X-rays with a 70% efficiency while the reflectivity at 16 keV was only 0.6%. The measured reflectivity of the mirror fell off in energy about 30 times faster than predicted by simple Fresnel theory assuming a smooth surface. This implies, for instance, that the harmonic rejection performance of platinum coated X-ray mirrors at synchrotron radiation sources may be significantly better than expected. In other measurements, very imperfect surfaces of unpolished sheet aluminum, copper and stainless steel surprisingly reflected as much as 30–50% of the X-rays incident upon them at small glancing angles.
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