Wave-Length Standards in the Extreme Ultra-Violet Spectra of Carbon, Nitrogen, Oxygen and Aluminum

Abstract

Wave-length determinations.---The wave-lengths of lines in the extreme ultra-violet spectra of carbon, nitrogen, oxygen and aluminum have been determined with an accuracy of.01 to.04A by direct comparison with iron standards.pp\ensuremath{'} groups in carbon ${\mathrm{C}}_{\mathrm{III}}$ and nitrogen ${\mathrm{N}}_{\mathrm{IV}}$-pp\ensuremath{'} Groups of carbon ${\mathrm{C}}_{\mathrm{III}}$ and nitrogen ${\mathrm{N}}_{\mathrm{IV}}$ have been completely resolved into six components and the ratio $\frac{{p}_{1}{p}_{2}}{{p}_{2}{p}_{3}}$ found to be 2.47 and 2.33 respectively.