EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Rhenium spectral lines. This spectrum, showing X-ray emission lines for various chemical elements, is from an experiment carried out in 1928 by German chemist and physicist Ida Noddack (1896-1978, nee Tacke). At centre are two lines for a new element labelled with the atomic number 75. This element, rhenium (Re), had been discovered by Noddack and her future husband Walter Noddack in 1925, working with Otto Berg. The emission lines labelled here are due to radiation emitted following transitions between electron shells. The lines are labelled K-alpha, K-beta, Lyman-alpha, and Lyman-eta. The other elements are copper (Cu), tungsten (W), and zinc (Zn).
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