富勒烯
碳纤维
化学物理
物理
红外线的
渐近巨支
分子动力学
冷凝
分子
天体物理学
星星
材料科学
天文
复合材料
复合数
热力学
量子力学
标识
DOI:10.1093/mnras/stad2754
摘要
ABSTRACT Fullerenes, including C60 and C70, have been detected in various astronomical environments. Understanding how their structures evolve over time is essential for gaining insights into their life cycle and making further observations. To address this, we conducted reactive molecular dynamics simulations to investigate the evolution of fullerenes in the circumstellar envelopes surrounding carbon-rich asymptotic giant branch stars. Our simulations employed a bottom-up chemistry scheme, wherein fullerenes grow by absorbing and condensing small carbon-based molecules. The results revealed the formation of different structures through heterogeneous reactions based on hydrogen concentration, leading to the emergence of onion-like nanostructures or single-layer fullerenes. To examine the impact of these structural changes on the infrared emission characteristics of fullerenes, we performed quantum chemical calculations. The results indicate that as fullerenes grow larger, additional emission features are introduced in the infrared spectrum. Moreover, two-layered fullerenes show noticeable blueshift or weakening effects on the bands associated with out-of-plane vibration modes.
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