Although many quantitative methods for isotopic analysis are used, emission molecular band spectra per se apparently have not been used. The method described here was used successfully to determine the relative amounts of 10B and 11B and should be applicable to other simple molecular band spectra, such as diatomic molecules in which the isotopic concentration of one of the atomic elements is fixed.
C. L. Chaney, "Use of Emission Molecular Band Spectra for Isotopic Analysis," Appl. Spectrosc. 22, 584-586 (1968)