The Absorption Spectrum of Diacetylene in the Near Ultraviolet

Abstract
The absorption spectrum of diacetylene gas was investigated down to λ1900A. In the region λλ2860–1900A more than eighty bands were found. Some regularities in the spectrum and the similarity with the cyanogen ultraviolet absorption spectrum are described. Resemblance between the diacetylene and cyanogen molecules is briefly discussed.

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