COSMIC-RAY-MEDIATED FORMATION OF BENZENE ON THE SURFACE OF SATURN'S MOON TITAN

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50703

Title:	COSMIC-RAY-MEDIATED FORMATION OF BENZENE ON THE SURFACE OF SATURN'S MOON TITAN
Authors:	Zhou,L;Zheng,WJ;Kaiser,RI;Landera,A;Mebel,AM;Liang,MC;Yung,YL
Contributors:	天文研究所
Keywords:	QUADRATIC CONFIGURATION-INTERACTION;MASS-SPECTROMETRY;ATMOSPHERE;IONIZATION;PHOTOCHEMISTRY;ENERGIES;SPECTRA;DENSITY;MODEL;MALDI
Date:	2010
Issue Date:	2012-03-27 18:08:17 (UTC+8)
Publisher:	國立中央大學
Abstract:	The aromatic benzene molecule (C(6)H(6))-a central building block of polycyclic aromatic hydrocarbon molecules-is of crucial importance for the understanding of the organic chemistry of Saturn's largest moon, Titan. Here, we show via laboratory experiments and electronic structure calculations that the benzene molecule can be formed on Titan's surface in situ via non-equilibrium chemistry by cosmic-ray processing of low-temperature acetylene (C(2)H(2)) ices. The actual yield of benzene depends strongly on the surface coverage. We suggest that the cosmic-ray-mediated chemistry on Titan's surface could be the dominant source of benzene, i.e., a factor of at least two orders of magnitude higher compared to previously modeled precipitation rates, in those regions of the surface which have a high surface coverage of acetylene.
Relation:	ASTROPHYSICAL JOURNAL
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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