Abstract

The wavelengths of 245 atomic emission lines, mainly C, N, and O, and commonly occurring as impurities in conventional light sources, have been measured from 875 A to 1940 A in the first order of a 21-ft vacuum grating spectrograph with a dispersion of 1.3 A per mm. Cu ii, Fe i, and Fe ii lines, whose wavelengths can be calculated accurately by the combination principle, were used as standards. The present work expands the number of previously known vacuum ultraviolet provisional standards and places them on a consistent wavelength scale with an average internal error of ±0.003 A, and an absolute error of less than ±0.005 A.

© 1955 Optical Society of America

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