Abstract
SOME new band systems of aluminium hydride at 2700 A. and 4950 A. have already been reported1. Using a new construction for the aluminium electrode which permitted large energies in the arc at a high pressure of hydrogen, we have obtained the band system at 4950 A. in the first order of our 6.5 m. concave grating. The band system has been analysed and is found to belong to a 1C1 transition, where the lower term 1 is in common with the well-known band system 11. Of the three branches expected (P, Q, R) only the Q and P branch has been found, owing to the strong overlapping from the AlO bands. The following constants have been evaluated.
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