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Victor Schumann (December 21, 1841 – September 1, 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 〔 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.〔Schumann V, ''Astronomy and astrophysics'', Volume 12, Carleton College (Northfield, Minn.). Goodsell Observatory〕 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.〔 〕 ==External links== * (Victor Schumann at encyclopedia.com ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Victor Schumann」の詳細全文を読む スポンサード リンク
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