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Victor Schumann
Victor Schumann (21 December 1841 – 1 September 1913) was a physicist and spectroscopist who in 1893 discovered the vacuum ultraviolet. Schumann wished to study the "Extreme Ultraviolet" region. For this, he used a prism and lenses in fluorite instead of quartz[1] allowing himself to be the first to measure spectra below 200 nm. Oxygen gas would absorb the radiation with a wavelength below 195 nm, but Schumann placed the entire apparatus under vacuum. He prepared his own photographic plates with a reduced layer of gelatin. He published on the hydrogen line in the spectrum of Nova Aurigae and in the spectrum of vacuum tubes.[2] His work opened the way to atomic emission spectroscopy, leading eventually to the discovery of the hydrogen spectral lines series (Lyman series) by Theodore Lyman in 1914.[1] References
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