= J. A. Bearden
{c}
{tag=Physicist}
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>.<X-ray wavelengths and X-ray atomic energy levels by J. A. Bearden>[First compilation, X-Ray Wavelengths, author byline and Table V]{ref}
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