PMID: 11605643Oct 19, 2001Paper

IR and UV spectroscopic data for polyynes: predictions for long carbon chain compounds in Titan's atmosphere

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
V VuittonY Benilan

Abstract

A better understanding of the complex organic chemistry occurring in the methane rich atmosphere of Titan can be achieved via the comparison of observations with results obtained by theoretical models. Available observations are still few but their analysis requires the knowledge of a large set of data, namely frequencies and absolute band intensities. Cross sections are also needed to develop the chemical schemes of photochemical models, in particular the schemes leading to the formation of haze particles visible on Titan. Unfortunately, some of these parameters are not well known, especially if one takes into account the extreme physical conditions of the studied object. This lack of data is particularly enhanced for polyynes because these compounds are highly unstable at the usual pressure and temperature conditions of a laboratory and therefore are very difficult to study. We have developed UV and IR studies, coupling experimental and theoretical approaches, in order to extrapolate the parameters available for short polyynes to longer carbon chains. In the mid-UV range, when the length of the chain increases, the absorption system of polyynes is shifted to longer wavelength and its oscillator strength increases linearly. In...Continue Reading

References

Jan 1, 1995·Planetary and Space Science·E de VanssayF Raulin
Jul 1, 1984·The Astrophysical Journal. Supplement Series·Y L YungJ P Pinto
Jan 1, 1995·Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)·P CollF Raulin
Apr 10, 1981·Science·R HanelC Ponnamperuma

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Citations

Feb 17, 2011·The Journal of Chemical Physics·Erin N Sharp-WilliamsDavid J Nesbitt
Feb 22, 2016·The Journal of Chemical Physics·Chih-Hsuan ChangDavid J Nesbitt
May 11, 2016·ACS Central Science·Tao ZengRoald Hoffmann
Sep 8, 2011·Physical Chemistry Chemical Physics : PCCP·Erin N Sharp-WilliamsDavid J Nesbitt

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