The Spectra of Potassium, K IV and K V, and of Calcium Ca V and Ca VI

Abstract

From 19 to 36 new lines each have been identified in K IV, K V, Ca V and Ca VI. In K IV and Ca V these include singlet and intercombination lines. The presence in the nebulae of lines due to the forbidden ${}_{}{}^3{}_{}{}^{}P-{}_{}{}^1{}_{}{}^{}D$ transitions in S I, Cl II, A III, K IV and Ca V is discussed.