We performed laboratory experiments to study the photochemical evolution induced by long‐UV irradiation of benzene ices in Titan's atmosphere. The aim of this study was to investigate whether photo‐processed benzene ices could lead to the formation of aerosols analogs to those observed in Titan's stratosphere. Prior to that, spectroscopic properties of amorphous and crystalline benzene ices were studied as a function of temperature, using infrared spectroscopy. UV photolysis experiments (λ > 230 nm) of benzene ices led to the formation of volatile photo‐products, among which fulvene is identified, and of a residue dominated by νCH IR features, demonstrating that pure aromatic‐based polymeric structures are not sufficient to explain the composition of Titan's stratospheric haze layer. However, we provide a characterization of long‐UV‐induced benzene‐containing aerosol analogs, which will contribute to Titan's surface organics layer. These data are of prime interest in the context of the future Dragonfly space mission.

中文翻译：

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泰坦平流层光化学的实验模拟：苯（C6H6）冰

我们进行了实验室实验，以研究泰坦大气中长期紫外线照射苯冰所引起的光化学演化。这项研究的目的是研究光处理过的苯冰是否会导致形成与泰坦平流层观测到的气溶胶类似物。在此之前，使用红外光谱研究了非晶苯和结晶苯冰的光谱性质随温度的变化。紫外线光解实验（λ 大于230 nm的苯冰导致形成挥发性光产物，其中鉴定出富勒烯，以及由νCHIR特征主导的残留物，表明纯芳基聚合物结构不足以解释土卫六的结构平流层雾度层。但是，我们提供了长时间紫外线诱导的含苯气溶胶类似物的表征，这将有助于Titan的表面有机物层。在未来的蜻蜓太空任务中，这些数据是最重要的。