Wave-Length Standards in the Extreme Ultraviolet

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Abstract
In order to be certain that the wave-length standards in the extreme ultraviolet are not subject to the small errors inherent in the method of overlapping orders the wave-lengths of several lines of carbon, nitrogen and oxygen have been determined by a method which is free of that objection. This has been accomplished by the comparison, using a two-meter normal incidence vacuum spectrograph, of the first order of the lines in question with the first order of certain lines of the Cu II spectrum. The wave-lengths of these Cu II lines have been computed with considerable accuracy by Shenstone by the use of the combination principle. The values obtained in the present investigation are in good agreement with those of Boyce and Rieke, and of Weber and Watson, which were obtained by the method of overlapping orders. Since the results of three investigations are now in satisfactory agreement, mean values, suitably weighted, are suggested for use as wave-length standards in the extreme ultraviolet.

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