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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >12C/13C Ratio in Ethane on Titan and Implications for Methane’s Replenishment
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12C/13C Ratio in Ethane on Titan and Implications for Methane’s Replenishment

机译：乙烷在泰坦中的12C / 13C比率及其对甲烷补给的影响

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摘要

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.
机译：从高光谱分辨率的地面观测中测得，Titan大气中乙烷中12C / 13C的丰度比为822 cm-1。值89（8）与碲标准一致，并且也与外层行星中看到的比率一致。这几乎与卡西尼号上的复合红外光谱仪（CIRS）发现的泰坦上乙烷的结果相同。乙烷的12C / 13C比高于Cassini / Huygens GCMS 82.3（1）在大气甲烷中测得的比率，代表乙烷中12C的富集，这可以用地层中约1.1的动力学同位素效应来解释甲基自由基。如果要不断补充甲烷以平衡光化学破坏，那么我们期望乙烷产品中的同位素组成达到接近与供应中相同的12C / 13C比率的平衡。乙烷中该比率的碲值意味着甲烷储层是原始的。

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