New Terms in Fe I, II, and III and Additional Far Ultraviolet Standards

Abstract

The iron spectrum excited in the Schüler discharge in He and Ne and the iron arc and spark in nitrogen have been studied in the ultraviolet from $\lambda 2300$ to $\lambda 600$. New terms have been identified in Fe I, II, and III and in addition a number of unclassified levels have been found in Fe II. Lists of all the lines identified from new or previously known levels are given. These lists include a number of lines in the region $\lambda 2225$ to $\lambda 1550$ whose wave-length can be accurately calculated by the combination principle from levels whose positions are determined by measures at longer wave-lengths. These lines will be useful as standards.