Temperature-dependent photoabsorption cross-sections of cyanoacetylene and diacetylene in the mid- and vacuum-UV: Application to Titan's atmosphere

Cyanoacetylene (HC 3N) and diacetylene (C 4H 2) play an important role in the photochemistry of Titan's atmosphere, in part because of their strong absorption between 110 and 180 nm. Accurate photoabsorption cross-sections at temperatures representative of Titan's atmosphere are required t...

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Bibliographic Details
Published in:Planetary and space science 2009, Vol.57 (1), p.10-22
Main Authors: Ferradaz, T., Bénilan, Y., Fray, N., Jolly, A., Schwell, M., Gazeau, M.C., Jochims, H.-W.
Format: Article
Language:English
Subjects:
Absorption cross-sections
Cyanoacetylene
Diacetylene
Low temperatures
Titan
Vacuum ultraviolet
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Summary:Cyanoacetylene (HC 3N) and diacetylene (C 4H 2) play an important role in the photochemistry of Titan's atmosphere, in part because of their strong absorption between 110 and 180 nm. Accurate photoabsorption cross-sections at temperatures representative of Titan's atmosphere are required to interprete Cassini observations and to calculate photolysis rates used in photochemical models. Using synchrotron radiation as a tunable vacuum ultraviolet (VUV) light source, we have measured absolute photoabsorption cross-sections of C 4H 2 and HC 3N with a spectral resolution of 0.05 nm in the region between 80 and 225 nm and at different temperatures between 173 and 295 K. The measured cross-sections are used to model transmission spectra of Titan atmosphere in the VUV.
ISSN:0032-0633
1873-5088
DOI:10.1016/j.pss.2008.10.005