On the Absorption of Acetylene and Di-Deutero-Acetylene in the Photographic Infrared

Abstract
Using an absorbing column 9 meters long of over 90 percent pure C2 D2 at a pressure of 85 cm, we observed no absorption bands in the region 7000 to 11,500A. This lack of absorption is discussed. A new absorption band of C2 H2 is found with origin at 7859A when an absorbing column 7.5 meters long at 90 cm pressure is used. The possible vibrational transitions giving rise to this band are discussed.

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