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), ha s been experimentally investigated in the region from 250 to 4300 cm(- 1) using a Fourier transform spectrometer. A total of 12 bands have be en analyzed. For each band, the characteristic wavenumber has been ded uced and the values of the absolute band intensities have been systema tically determined together with their associated uncertainties. The r esults provide important data for planetary studies. In particular, a better estimate of the mean stratospheric abundance of butadiyne in Ti tan's atmosphere is obtained: its value is about 50% higher than previ ously reported. (C) 1995 Academic Press, Inc.