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Fr. Shindo, Y. Benilan (LISA-CNRS, Universites Paris 7- Paris 12), J.-C. Guillemin (LCOB-ENSCR), François Raulin (LISA-CNRS, Universites Paris 7- Paris 12)
The C6H2 interest is its possible involvement in the atmospheric chemistry of Titan. It appears in modeling and experimental simulations as a step in the formation of higher polyynes which can lead to heavier particles like aerosols. As this molecule is obtained by organic chemical synthesis, by-products of the synthesis, even in small quantities, can strongly affect its UV spectrum. Several low temperature distillations allowed us to get a pure sample of C6H2. The UV spectrum was obtained on the spectrometer of the SIPAT experience in the 185-350 nm range. This experience allow to proceed in conditions as close as possible to those on Titan, and to study the temperature dependence of absorption coefficient. Here two temperatures are presented: room temperature and 233 K. SIPAT is also used to investigate the vapor pressure of C6H2. The IR study reviews a previous work on band intensities in the 4000-400 cm-1 range, and show that past results suffer from saturation. Moreover, our 10.6 m path cell allowed us to measure minor bands with great confidence.
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