An Experimental Study of Certain Electronic Bands of CO2

The electronic bands of C${\mathrm{O}}_2$ lying near 2880A and 2895A are described and a method given for photographing them under very high dispersion. Three good plates were obtained which gave concordant results when examined with a comparator and with a Moll microphotometer. The fine structure, the probable emitter of the bands, and their relation to other bands of the spectrum are discussed.