Abstract
Numerous experiments have already been performed, simulating the evolution of gaseous mixtures containing CH4 when submitted to energy flux. From their results, it appears that a variety of organic compounds, including unsaturated hydrocarbons and nitriles such as HCN, can be synthesized into noticeable amounts from CH4−N2 mixtures. In particular, systematic studies of the influence of the composition of the mixture on the nature and amount of synthesized compounds show that organic volatile nitriles, and particularly cyanoacetylene and cyanogen, are formed only in media rich in nitrogen. Those nitriles have been identified very recently in the atmosphere of Titan, and thus, data from such laboratory experiments may provide important indirect information on the organic chemistry occuring at the periphery of this satellite of Saturn. However, during these experiments, there is a continuous formation and accumulation of molecular hydrogen, which does not occur in the atmosphere of Titan, because of H2 escape. In order to reassess the data already available from this type of laboratory studies, experiments on CH4−N2 atmospheres, with and without H2 escape, have been recently performed. The influence of this parameter on the chemical evolution of the atmosphere and on the nature and relative quantities of organic compounds has been studied.
After reviewing these experiments, implications of the obtained results on the organic chemistry at the periphery of Titan are discussed.
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Balestic, F.: 1974, ‘Synthèse abiotique d'acides aminés par voie radiochimique’, thèse de Doctorat d'Etat es Sciences, Université Paris Sud, Orsay.
Bossard, A.: 1979, ‘Rôle du rayonnement UV dans les synthèses prébiologiques,’ thèse de Doctorat de 3ème cycle, Chimie Physique, Université Pierre et Marie, Curie, Paris.
Bossard, A. and Toupance, G.: 1980,Nature 288 (5788), 243.
Bossard, A., Raulin, F., Mourey, D., and Toupance, G.: 1981, in Y. Wolman (ed.),Origin of Life, D. Reidel Publ. Co., Dordrecht, Holland, p. 83.
Burke, J. A.: 1977, ‘Investigations of the photochemistry of mixtures of methane, nitrogen and ammonia with Lyman-Alpha radiation’, Ph.D. Thesis, Cal. Inst. Technology.
Capone, L. A., Dubach, J., Whitten, R. C., Prasad, S. S., and Santhanam, K.: 1980,Icarus 44, 72.
Capone, L. A., Prasad, S. S., Huntress, W. T., Whitten, R. C., Dubach, J., and Santhanam, K.: 1981,Nature 293, 45.
Chang, S., Scattergood, T., Aronowitz, S., and Flores, J.: 1979,Rev. Geophys. Space Phys. 17 (8), 1923.
Dodonova, N. Ya.: 1966,Russ. J. Phys. Chem. 40, 523.
Ferris, J. P. and Chen, C. T.: 1975,J. Amer. Chem. Soc. 97 (11), 2962.
Ferris, J. P. and Joshi, P. C.: 1978,Science 201, 361.
Ferris, J. P., Donner, D. B., and Lobo, A. P.: 1973,J. Mol. Biol.,74, 499.
Hanel, R., Conrath, B., Flasar, F. M., Kunde, V., Maguire, W., Pearl, J., Pirraglia, J., Samuelson, R., Herath, L., Allison, M., Cruikshank, D., Gautier, D., Gierasch, P., Horn, L., Koppany, R., and Ponnamperuma, C.: 1982,Science 212, 192.
Hunten, D. M.: 1978, in D. M. Hunten and D. Morrison (eds.),The Saturn System, NASA Conference Publication 2068, p. 127.
Kuiper, G. P.: 1944,Astrophys. J. 100, 378.
Kunde, V. G., Aikin, A. C., Hanel, R. A., Jennings, D. E., Maguire, W. C., and Samuelson, R. E.: 1981,Nature 292, 686.
Mourey, D.: 1982 ‘Rôle de l'évasion d'hydrogène sur l'Évolution Chimique de modèles de l'atmosphère de la Terre Primitive et les étapes initiales de l'Evolution Prébiologique,’ Thèse de Doctorat 3ème cycle, Chimie Physique, Université Pierre et Marie Curie, Paris.
Mourey, D., Raulin, F., and Toupance, G.: 1981, in Y. Wolman (ed.),Origin of Life, D. Reidel Publ. Co., Dordrecht, Holland, p. 73.
Münch, G., Trauger, J. T., and Roesler, F. L.: 1977,Astrophys. J. 216, 963.
Oró, J. and Lazcano-Araujo, A.: 1982, in B. Vennesland (ed.),HCN Metabolism, Academic Press, New York (in press).
Podolak, M., Noy, N., and Bar-Nun, A.: 1979,Icarus 40 (2), 193.
Ponnamperuma, C.: 1976,Icarus 29, 321.
Raulin, F. and Toupance, G.: 1975,Origins of Life 6, 507.
Raulin, F. and Toupance, G.: 1976,Bull. Soc. Chim. Fr. (1–2), 29.
Raulin, F., Bossard, A., Toupance, G., and Ponnamperuma, C.: 1979,Icarus 38, 358.
Sanchez, R. A., Ferris, J. P., and Orgel, L. E.: 1966,Science 154, 784.
Scattergood, T., Lesser, P., and Owen, T.: 1974,Nature 247, 100.
Scattergood, T., Lesser, P., and Owen, T.: 1975,Icarus,24, 465.
Schwartz, A. W.: 1981, in E. K. Duursma and R. Dawson (eds.),Marine Organic Chemistry, Elsevier, Amsterdam, p. 7.
Strobel, D. F.: 1974,Icarus 21, 466.
Strobel, D. F.: 1982,Origins of Life 12 (3), 244 (Abstract).
Toupance, G.: 1973, ‘Etude de l'évolution sous apport d'énergie de modèles de l'atmosphère primitive de la Terre,’ Thèse de Doctorat d'Etat et Sciences, Université de Paris.
Toupance, G., Raulin, F. and Buvet, R.: 1971, in R. Buvet and C. Ponnamperuma (eds.),Molecular Evolution, Vol. 1, North Holland, Amsterdam, p. 83.
Toupance, G., Mourey, D., and Raulin, F.: 1978, inEvolution of Planetary Atmospheres and Climatology of the Earth, Centre National d'Etudes Spatiales (ed.), Toulouse, p. 31.
Toupance, G., Raulin, F., and Buvet, R.: 1975,Origins of Life 6, 83.
Trafton, L. M.: 1972,Astrophys. J. 175, 295.
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Raulin, F., Mourey, D. & Toupance, G. Organic syntheses from CH4−N2 atmospheres: Implications for Titan. Origins Life Evol Biosphere 12, 267–279 (1982). https://doi.org/10.1007/BF00926897
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DOI: https://doi.org/10.1007/BF00926897