Gas infrared spectra, assignments, and absolute IR band intensities of C_4N_2 in the 250-3500 cm~(-1) region: implications for Titan's stratosphere

摘要

The IR spectrum of gaseous dicyanoacetylene, NC-C≡C-CN, is studied in the 3500-220 cm~(-1) range, employing Fourier transform spectroscopy. A total of 17 bands are analyzed and assigned. The absolute intensity is determined and the associated uncertainty is estimated for each of the bands. The resulting data are used to study the detectability of gaseous C_4N_2 in Titan's atmosphere. In particular a better estimate of the upper limits of its abundance in Titan's atmosphere is obtained when our results are used to reanalyze Voyager IRIS infrared spectra.