Temperature dependence of HC3N,C6H2, and C4N2 mid-UV absorption coefficients. Application to the interpretation of Titan's atmospheric spectra |
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| Authors: | Y Bénilan D Andrieux M Khlifi P Bruston F Raulin J -C Guillemin C Cossart-Magos |
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| Institution: | (1) Laboratoire Interuniversitaire des Systèmes Atmosphériques, URA 1404 du CNRS, Université Paris XII-Val de Marne, 61 Avenue du Général de Gaulle, 94010 Créteil Cédex, France;(2) Laboratoire de Physico-Chimie Structurale, URA 704 du CNRS, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cédex, France;(3) Laboratoire de Photophysique Moléculaire du CNRS and Institut de Physico-Chimie Moléculaire, Université Paris-Sud, Bat. 213, F-91405 Orsay Cédex, France |
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| Abstract: | Three organic compounds (HC3N, C6H2, and C4N2) relevant of Titan's atmosphere have been studied within the framework of the SIPAT (Spectroscopie UV d'Intérêt Prébiologique dans l'Atmosphère de Titan) program. Since this facility is still unable to reach the very low temperatures ( 170 K) of Titan's high atmosphere, spectra have to be obtained at several absorption-cell temperatures, and the data extrapolated towards lower temperatures. Previously published HC3N and C6H2 absorption coefficient data are reviewed, while new spectroscopic data are presented on C4N2. Integrated intensity calculations over the vibrational bands are performed apart from the background continuum. Thus, only the band contrast is considered here. While, the temperature dependence of the hot-band integrated intensity follows a Boltzmann distribution, we have enhanced the fit through an empirical parametrisation to account for the observed temperature dependence of the C4N2 and HC3N absorption coefficients, and to extrapolate those data to the low temperature conditions of Titan's high atmosphere. Finally, we discuss the implications of the results to possible detection by remote sensing observations of these minor compounds in Titan's atmosphere. |
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