The B(3∑u−)−X(3∑g−) band system of the Se2 molecule

Abstract

Abstract A strong system of red-degraded bands of the Se2 molecule, which lies in the region 3250 to about 6700 A, has been known for very many years, and has been observed in absorption, emission and in fluorescence. However, the complexity of the spectrum of the natural mixture of selenium isotopes is such that no satisfactory analysis of the system has yet been advanced and even the number of systems was in doubt at the beginning of the present work.