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Interferometric Wavelengths of Thorium Lines between 2650 A and 3400 A

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Abstract

Interferometric wavelengths, suitable for use as secondary standards of class “B”, are given for 68 thorium lines in the range 2650 to 3400 A, as emitted by a thorium-iodide electrodeless discharge tube without carrier gas. The rms deviation from the mean is 3×10−4 A. The method of preparation of a reliable and very intense thorium electrodeless tube is described.

© 1962 Optical Society of America

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