R. Coronea Borealis vs Olefinic Hydrocarbon Spectrum

RCB from 1942 to 1950. The curve is recognizable as an olefinic hydrocarbon posessing at least two unsaturated types as the complex band at 10 - 11.25 microns. This feature is confirmed by the two small bands near 6 microns, and the single band at 5.5 microns which is an overture of the longer wavelength bands. Fig. 3A is very similar to Fig. 3B, the IR spectrum of butadiene dimer.