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Lyman, Theodore

US physicist whose work was confined to the spectroscopy of the extreme ultraviolet region. Lyman was born in Boston and studied at Harvard, and briefly in Europe at Cambridge and Göttingen. His working life was spent at Harvard, where he became professor in 1921. When Lyman began his research, the ultraviolet end of the spectrum had been observed by enclosing the spectroscope in a vacuum with fluorite windows. Using a concave ruled grating instead of a fluorite prism, Lyman discovered false lines in the ultraviolet due to light in the visible region, and these came to be called Lyman ghosts. He established the limit of transparency of fluorite to be 1,260 Å (1 Å = 10-10m) and looked at the absorbency of other suitable solids but found none better. He also examined the absorption of various gases. By 1917 Lyman had extended the spectrum to 500 Å. A series of lines in the hydrogen spectrum discovered by Lyman 1914 was named the Lyman series. He correctly predicted that the first l...    Continue Reading

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