A physicist who compiled X-ray wavelengths for precision spectroscopy. His 1967 compilation tabulates characteristic lines from elements including iron and molybdenum. Such reference wavelengths connect an observed diffraction angle to a crystal spacing through Bragg's law, and let a measured line be compared with an established atomic transition.[ref]
X-ray wavelengths and X-ray atomic energy levels by J. A. Bearden. First compilation, X-Ray Wavelengths, author byline and Table V
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