在拱星包层中寻找氢化的C $_{60}$（富勒烷）
Search for Hydrogenated C$_{60}$ (fulleranes) in Circumstellar Envelopes
摘要：
最近在太空中探测到富勒烯（C $_{60}$），并将五个弥漫的星际带肯定地指定为C $_{60}^+$，这加强了富勒烯相关化合物可以有效地在星周包层中形成，并在星际介质中大量存在的概念。实验研究表明，C $_{60}$可以很容易地氢化，提高了氢化富勒烯（或富勒烷，C $_{60}$ H $_m$，$m=1-60$）可能在空间中丰富的可能性。本文对C $_{60}$ H $_m$异构体的振动模式进行了理论研究。我们的研究结果表明，从C $_{60}$骨架振动的四个中红外波段仍然突出的轻微氢化C $_{60}$，但其强度在不同程度上减少，增加氢化。因此，可能的是，所观察到的红外波段分配给C $_{60}$可能是由于富勒烯和富勒烷的混合物。这为观察到的C $_{60}$谱带比的分散提供了可能的解释。我们的计算表明，由于高度氢化的C $_{60}$的呼吸模式，在15 $μ$ m左右的特征可能是天文学上可检测的。本文报道了在35 C $_{60}$源中对这一特征的初步搜索。
英文摘要：
The recent detection of fullerene (C$_{60}$) in space and the positive assignment of five diffuse interstellar bands to C$_{60}^+$ reinforce the notion that fullerene-related compounds can be efficiently formed in circumstellar envelopes and be present in significant quantities in the interstellar medium. Experimental studies have shown that C$_{60}$ can be readily hydrogenated, raising the possibility that hydrogenated fullerenes (or fulleranes, C$_{60}$H$_m$, $m=1-60$) may be abundant in space. In this paper, we present theoretical studies of the vibrational modes of isomers of C$_{60}$H$_m$. Our results show that the four mid-infrared bands from the C$_{60}$ skeletal vibrations remain prominent in slightly hydrogenated C$_{60}$, but their strengths diminish in different degrees with increasing hydrogenation. It is therefore possible that the observed infrared bands assigned to C$_{60}$ could be due to a mixture of fullerenes and fulleranes. This provides a potential explanation for the observed scatter of the C$_{60}$ band ratios. Our calculations suggest that a feature around 15$μ$m due to the breathing mode of heavily hydrogenated C$_{60}$ may be detectable astronomically. A preliminary search for this feature in 35 C$_{60}$ sources is reported.
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