Abstract

Accepted neon standards cover the region 6929–5852A. We have observed the first spectrum of neon throughout the region 8919–3126A in order to assist in establishing secondary standards in that part of this range where none exist.

The first spectrum of natural mercury was observed from 7020 to 2200A in order to discover in what part of this range standards of suitable intensity will be available when lines emitted by Hg198 have been measured; and to find out which lines (if any) of the natural element may serve as standards when mercury is accidently or unavoidably present in a low pressure source. It is shown that some lines of natural mercury are suitable for secondary standards, and nearly all may be useful when an accuracy of no more than a part per million is required.

© 1950 Optical Society of America

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