ABSOLUTE IR BAND INTENSITIES OF DIACETYLENE IN THE 250-4300 CM(-1) REGION - IMPLICATIONS FOR TITAN ATMOSPHERE

The infrared spectrum of C4H2, butadyine (also called diacetylene), has been experimentally investigated in the region from 250 to 4300 cm(-1) using a Fourier transform spectrometer. A total of 12 bands have been analyzed. For each band, the characteristic wavenumber has been deduced and the values of the absolute band intensities have been systematically determined together with their associated uncertainties. The results provide important data for planetary studies. In particular, a better estimate of the mean stratospheric abundance of butadiyne in Titan's atmosphere is obtained: its value is about 50% higher than previously reported. (C) 1995 Academic Press, Inc.