An experimental atomic physicist who developed ultraviolet spectroscopy at wavelengths strongly absorbed by air. Evacuated optical apparatus made this region experimentally accessible, and the Lyman series of hydrogen became a fundamental example of atomic line structure. The apparatus work mattered as much as the wavelength measurement: removing absorption along the optical path was necessary to observe the radiation at all.[ref]
Theodore Lyman, Pioneer of Ultraviolet Vacuum Spectroscopy by Paul Horowitz. pp. 1, 3–4 and Figures 2–5: extreme-ultraviolet apparatus and vacuum techniques
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