C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment

Donald E. Jennings, Paul N. Romani, Gordon L. Bjoraker, Pedro V. Sada, Conor A. Nixon, Allen W. Lunsford, Robert J. Boyle, Brigette E. Hesman, George H. McCabe

Resultado de la investigación

13 Citas (Scopus)

Resumen

The 12C/13C abundance ratio in ethane in the atmosphere of Titan has been measured at 822 cm-1 from high spectral resolution ground-based observations. The value, 89(8), coincides with the telluric standard and also agrees with the ratio seen in the outer planets. It is almost identical to the result for ethane on Titan found by the composite infrared spectrometer (CIRS) on Cassini. The 12C/13C ratio for ethane is higher than the ratio measured in atmospheric methane by Cassini/Huygens GCMS, 82.3(1), representing an enrichment of 12C in the ethane that might be explained by a kinetic isotope effect of approximately 1.1 in the formation of methyl radicals. If methane is being continuously resupplied to balance photochemical destruction, then we expect the isotopic composition in the ethane product to equilibrate at close to the same 12C/13C ratio as that in the supply. The telluric value of the ratio in ethane then implies that the methane reservoir is primordial.
Idioma originalEnglish
Páginas (desde-hasta)11101-11106
Número de páginas6
PublicaciónJournal of Physical Chemistry A
Volumen113
N.º42
DOI
EstadoPublished - 22 oct 2009

Huella dactilar

replenishment
Ethane
Titan
Methane
ethane
methane
Spectral resolution
Planets
Isotopes
spectral resolution
isotope effect
destruction
Spectrometers
planets
spectrometers
atmospheres
Kinetics
high resolution
kinetics
products

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Citar esto

Jennings, D. E., Romani, P. N., Bjoraker, G. L., Sada, P. V., Nixon, C. A., Lunsford, A. W., ... McCabe, G. H. (2009). C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment. Journal of Physical Chemistry A, 113(42), 11101-11106. https://doi.org/10.1021/jp903637d
Jennings, Donald E. ; Romani, Paul N. ; Bjoraker, Gordon L. ; Sada, Pedro V. ; Nixon, Conor A. ; Lunsford, Allen W. ; Boyle, Robert J. ; Hesman, Brigette E. ; McCabe, George H. / C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment. En: Journal of Physical Chemistry A. 2009 ; Vol. 113, N.º 42. pp. 11101-11106.
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abstract = "The 12C/13C abundance ratio in ethane in the atmosphere of Titan has been measured at 822 cm-1 from high spectral resolution ground-based observations. The value, 89(8), coincides with the telluric standard and also agrees with the ratio seen in the outer planets. It is almost identical to the result for ethane on Titan found by the composite infrared spectrometer (CIRS) on Cassini. The 12C/13C ratio for ethane is higher than the ratio measured in atmospheric methane by Cassini/Huygens GCMS, 82.3(1), representing an enrichment of 12C in the ethane that might be explained by a kinetic isotope effect of approximately 1.1 in the formation of methyl radicals. If methane is being continuously resupplied to balance photochemical destruction, then we expect the isotopic composition in the ethane product to equilibrate at close to the same 12C/13C ratio as that in the supply. The telluric value of the ratio in ethane then implies that the methane reservoir is primordial.",
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Jennings, DE, Romani, PN, Bjoraker, GL, Sada, PV, Nixon, CA, Lunsford, AW, Boyle, RJ, Hesman, BE & McCabe, GH 2009, 'C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment', Journal of Physical Chemistry A, vol. 113, n.º 42, pp. 11101-11106. https://doi.org/10.1021/jp903637d

C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment. / Jennings, Donald E.; Romani, Paul N.; Bjoraker, Gordon L.; Sada, Pedro V.; Nixon, Conor A.; Lunsford, Allen W.; Boyle, Robert J.; Hesman, Brigette E.; McCabe, George H.

En: Journal of Physical Chemistry A, Vol. 113, N.º 42, 22.10.2009, p. 11101-11106.

Resultado de la investigación

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T1 - C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment

AU - Jennings, Donald E.

AU - Romani, Paul N.

AU - Bjoraker, Gordon L.

AU - Sada, Pedro V.

AU - Nixon, Conor A.

AU - Lunsford, Allen W.

AU - Boyle, Robert J.

AU - Hesman, Brigette E.

AU - McCabe, George H.

PY - 2009/10/22

Y1 - 2009/10/22

N2 - The 12C/13C abundance ratio in ethane in the atmosphere of Titan has been measured at 822 cm-1 from high spectral resolution ground-based observations. The value, 89(8), coincides with the telluric standard and also agrees with the ratio seen in the outer planets. It is almost identical to the result for ethane on Titan found by the composite infrared spectrometer (CIRS) on Cassini. The 12C/13C ratio for ethane is higher than the ratio measured in atmospheric methane by Cassini/Huygens GCMS, 82.3(1), representing an enrichment of 12C in the ethane that might be explained by a kinetic isotope effect of approximately 1.1 in the formation of methyl radicals. If methane is being continuously resupplied to balance photochemical destruction, then we expect the isotopic composition in the ethane product to equilibrate at close to the same 12C/13C ratio as that in the supply. The telluric value of the ratio in ethane then implies that the methane reservoir is primordial.

AB - The 12C/13C abundance ratio in ethane in the atmosphere of Titan has been measured at 822 cm-1 from high spectral resolution ground-based observations. The value, 89(8), coincides with the telluric standard and also agrees with the ratio seen in the outer planets. It is almost identical to the result for ethane on Titan found by the composite infrared spectrometer (CIRS) on Cassini. The 12C/13C ratio for ethane is higher than the ratio measured in atmospheric methane by Cassini/Huygens GCMS, 82.3(1), representing an enrichment of 12C in the ethane that might be explained by a kinetic isotope effect of approximately 1.1 in the formation of methyl radicals. If methane is being continuously resupplied to balance photochemical destruction, then we expect the isotopic composition in the ethane product to equilibrate at close to the same 12C/13C ratio as that in the supply. The telluric value of the ratio in ethane then implies that the methane reservoir is primordial.

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Jennings DE, Romani PN, Bjoraker GL, Sada PV, Nixon CA, Lunsford AW y otros. C-12/C-13 Ratio in Ethane on Titan and Implications for Methane's Replenishment. Journal of Physical Chemistry A. 2009 oct 22;113(42):11101-11106. https://doi.org/10.1021/jp903637d