X-ray mirror reflectivities were measured on float glass using an energy dispersive technique. Smooth uncoated float glass mirrors were observed to reflect hard X-rays up to 38 keV with high efficiency. The harmonic rejection capabilities of float glass have been utilized at CHESS to efficiently reduce the harmonic content of diffracted beams. For example, for a mirror set at an angle of 3.5 mrad, only 0.8% of the X-rays were reflected at 16 keV, while for 8 keV X-rays the reflectivity was 85%. In other experiments, changing the surface roughness of float glass by chemical etching altered the falloff rate beyond the knee of the reflection curve by factors as large as 2.5. © 1982.
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