Abstract
A NEW system of some eighty absorption bands has been discovered in the spectrum of arsenic between 2200 A. and 2750 A., which can be definitely assigned to the diatomic molecule. This includes the five faint fluorescence bands observed by Roson1 and tentatively ascribed to As2. The whole system bears a striking resemblance to that of P2, investigated by Herzberg2, where ΔG″ is about 750 cm.1 and G 470 cm.1. A preliminary analysis gives for arsenic G values that are about 420 cm.1 for the lower and 270 cm.1 for the upper state. The vibrational levels of both states converge very slowly.
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