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首页> 外文期刊>The Astrophysical journal >THE DECOMPOSITION OF HYDROGENATED AMORPHOUS CARBON: A CONNECTION WITH POLYCYCLIC AROMATIC HYDROCARBON MOLECULES
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THE DECOMPOSITION OF HYDROGENATED AMORPHOUS CARBON: A CONNECTION WITH POLYCYCLIC AROMATIC HYDROCARBON MOLECULES

机译：氢化非晶态碳的分解：与多环芳族烃分子的连接

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摘要

We have produced thin solid films of hydrogenated amorphous carbon (HAC) by vapor deposition in vacuum and have investigated the structure and infrared spectra of these materials under conditions in which they are at the point of decomposition. We find that the IR absorption spectrum of HAC under these conditions contains all the major spectral components seen in emission in nebulae. In addition, high-resolution scanning tunneling microscopy of HAC prior to decomposition reveals protographitic islands with dimensions ～1-5 nm showing that polycyclic aromatic hydrocarbon (PAH)-like molecular groups evolve from HAC. These experimental results suggest for the first time how PAHs and HAC may be related and how PAH molecules could evolve from HAC in regions of high excitation. The material produced as HAC decomposes is a very low density carbonaceous "aerogel" consisting primarily of these aromatic protographitic clusters in a weakly connected friable network. These protographitic clusters may be the source of interstellar graphite grains.
机译：我们已经通过在真空中进行气相沉积制备了氢化非晶碳（HAC）的固态薄膜，并研究了这些材料在分解点处的结构和红外光谱。我们发现，在这些条件下，HAC的红外吸收光谱包含在星云发射中看到的所有主要光谱成分。此外，HAC分解前的高分辨率扫描隧道显微镜观察揭示了尺寸约为1-5 nm的原形岛，表明类多环芳烃（PAH）分子是从HAC演化而来的。这些实验结果首次提出了PAHs和HAC可能如何相关以及在高激发区域PAH分子如何从HAC演变而来。 HAC分解时产生的材料是一种非常低密度的碳质“气凝胶”，主要由处于弱连接脆性网络中的这些芳香原形团簇组成。这些原形团簇可能是星际石墨晶粒的来源。

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