arXiv 2007.038622020-07-31astro-ph.GAcond-mat.mes-hallphysics.atm-clus

石墨烯分子对富碳行星状星云红外波段的贡献

Graphene Molecules Contributing to the Infrared Bands of Carbon Rich Planetary Nebulae

Norio Ota, Aigen Li, Laszlo Nemes, Masaaki Otsuka

备注：: 21 pages, 8 figures, 1 table, 1 appendix

摘要：

众所周知，自2010年以来，富勒烯C60在星际空间中广泛存在。此外，众所周知，石墨烯是用于合成富勒烯的源材料。在这里，我们简单地假设石墨烯在空间中的存在。计算了石墨烯分子的红外光谱，并与天文观测光谱和实验室实验光谱进行了比较。采用一个天文学假设，即C13、C24和C54的电荷中性石墨烯中存在单空穴，得到C12、C23和C53。它们在六边形网络中有一个碳五边形环。不同的空隙位置被分类为不同的物种。单个空隙被3个自由基碳包围，保持6个自旋。自旋态影响分子构型和振动光谱。令人惊讶的是，三重态比单重态稳定。大多数电荷中性和三重态自旋态的物质显示出与观测到的富碳行星状星云Tc1和Lin49非常相似的光谱。我们可以在18.9微米处指定主带，并且在6.6、7.0、7.6、8.1、8.5、9.0和17.4微米处指定子带。有趣的是，这些石墨烯物种也在激光诱导碳等离子体的实验室实验中被分配，这是空间中碳团簇产生的类比。结论是，石墨烯分子可能有助于富碳行星状星云的红外发射带。

英文摘要：

It is well known since 2010 that fullerene C60 is widespread through the interstellar space. Also, it is well known that graphene is a source material for synthesizing fullerene. Here, we simply assume the occurrence of graphene in space. Infrared spectra of graphene molecules are calculated to compare both to astronomical observational spectra and to laboratory experimental one. Model molecules for DFT calculation are selected by one astronomical assumption, that is, single void in charge neutral graphene of C13, C24 and C54, resulting C12, C23 and C53. They have a carbon pentagon ring within a hexagon network. Different void positions are classified as different species. Single void is surrounded by 3 radical carbons, holding 6 spins. Spin state affects molecular configuration and vibrational spectrum. It was a surprise that the triplet state is stable than the singlet. Most of charge neutral and triplet spin state species show closely resembling spectra with observed one of carbon rich planetary nebulae Tc1 and Lin49. We could assign major bands at 18.9 micrometer, and sub-bands at 6.6, 7.0, 7.6, 8.1, 8.5, 9.0 and 17.4 micrometer. It is interesting that those graphene species were also assigned in the laboratory experiments on laser-induced carbon plasma, which are analogies of carbon cluster creation in space. The conclusion is that graphene molecules could potentially contribute to the infrared emission bands of carbon-rich planetary nebulae.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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