The Singlet System of the Oxygen Arc Spectrum and the Origin of the Green Auroral Line

Abstract

The oxygen arc spectrum has been investigated under varied conditions in the extreme ultraviolet. A number of observed lines have been arranged in the singlet system of terms. The values of the low terms ${}_{}{}^1{}_{}{}^{}D_2^{}{}_{}{}^{}$ and ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ have been fixed