Abstract
Two band systems of the BS molecule, called the α and γ systems, have been excited in a discharge through B2S3 vapor in a quartz discharge tube. Vibrational and rotational analyses of these systems have been carried out, and it is shown that both systems have the same lower state, which is a 2Σ state. Both the upper states are 2Π states. The α system is analogous to the α system of BO, but the γ system has not been observed for BO. Tables giving the vibrational and rotational constants of the various states are given. A third system of strong bands in the blue–green region is observed simultaneously with the α and γ bands in the discharge. These bands have not yet been interpreted. By means of the observed isotopic bands, it has been proved that BS is the emitter of the α and γ systems.
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