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Using a vacuum reflectometer which employs a mica crystal monochromator and a proportional counter detector, measurements of the efficiency of reflection of soft x rays by optical flats of Pyrex glass and stainless steel were made at a number of wavelengths in the region 5-16 Å. Values of the refractive index and mass absorption coefficient of the media were obtained from the curves of reflection efficiency plotted against glancing angle and were compared with predicted values. A disagreement between theory and experiment was found which could be attributed to microscopic surface roughness and a reduced surface electron density.
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Stewardson et al. (1965) studied this question.
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