Abstract
A systematic study of the problem of the simultaneous excitation of two band systems in the same source has been made by measuring the gross intensity-distribution in the AlO blue-green and CN violet systems in the carbon arc. The results have been applied to the interpretation of the relation between the vibration temperature and rotation temperature in this particular source, in the light of the results obtained by Ornstein and Brinkman. The ratios of the excitation temperatures of the CN system to those of the AlO system measured simultaneously in the same source have been examined and compared with corresponding ratios for C2 to CH derived by Lochte-Holtgreven under similar conditions. It has been concluded that in the case of simultaneous excitation, so long as the molecules remain the same, the ratio of their temperatures remains practically constant, irrespective of the conditions.
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