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New Wavelengths for Some Helium (He i) Lines

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Abstract

New vacuum wavelengths for nine lines of He i in the near ultraviolet and visible regions are given. They were obtained by measurement relative to 5462.2707 A and 4359.5625 A of Hg198i with an evacuated Fabry-Perot interferometer. Liquid-nitrogen cooled helium lamps were used. Interference fringes were obtained for the helium line 5017 A with spacers up to 50 mm in length. The wavelength of this line, which was used as a reference wavelength in some previous work on the Rydberg constant, is found to be 5017.0772±0.0003 A (vac.) relative to the stated values for the two standards.

© 1960 Optical Society of America

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