Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Victor Schumann (1841 – September 1, 1913) was a physicist and spectroscopist who in 1893 discovered the vacuum ultraviolet. He was the first to measure spectra below 200 nm. For this, he used a prism and lenses in fluorin instead of quartz, he prepared himself photographic plates with a reduced layer of gelatin, and he placed the entire apparatus under vacuum. Indeed, oxygen gas absorbs the radiation with a wavelength below 195 nm.

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