In this review I summarize the current state of knowledge about the composition of Titan’s atmosphere and our current understanding of the suggested chemistry that leads to that observed composition. I begin with our present knowledge of the atmospheric composition, garnered from a variety of measurements including Cassini–Huygens, the Atacama Large Millimeter/submillimeter Array, and other ground- and space-based telescopes. This review focuses on the typical vertical profiles of gases at low latitudes rather than global and temporal variations. The main body of the review presents a chemical description of how complex molecules are believed to arise from simpler species, considering all known “stable” molecules─those that have been uniquely identified in the neutral atmosphere. The last section of the review is devoted to the gaps in our present knowledge of Titan’s chemical composition and how further work may fill those gaps.

中文翻译：

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土卫六大气层的成分和化学成分

在这篇评论中，我总结了有关土卫六大气成分的当前知识状况，以及我们目前对导致所观察到的成分的建议化学成分的理解。我首先介绍了我们目前对大气成分的了解，这些知识是通过各种测量获得的，包括卡西尼-惠更斯望远镜、阿塔卡马大型毫米/亚毫米阵列以及其他地面和太空望远镜。本综述重点关注低纬度地区气体的典型垂直剖面，而不是全球和时间变化。考虑到所有已知的“稳定”分子（那些在中性大气中被独特识别的分子），该评论的主体部分对复杂分子如何被认为是由简单物种产生进行了化学描述。评论的最后一部分专门讨论了我们目前对泰坦化学成分的了解的空白以及进一步的工作如何填补这些空白。