Electronic States and Band Spectrum Structure in Diatomic Molecules. VIII. Some Empirical Relations inσ-Type Doubling

Abstract

Some of the empirical relations which exist in $\sigma$-type doubling are summarized. In particular, the magnitudes of the doublet intervals as a function of $j$, and in relation to $\frac{\Delta E}{B}$, are considered. The observed relations, although very varied, are consistently in agreement with theoretical work of Van Vleck (cf. preceding paper). Van Vleck's work shows definitely that the ${}_{}{}^3{}_{}{}^{}P$ levels involved in the second positive nitrogen bands are both normal (not inverted).