Rotational spectrum and structure of Si3.
Rotational spectrum and structure of Si3.
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Si3 的旋转光谱和结构。
DOI：
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发表时间：
2003
影响因子：
8.6
通讯作者：
P. Thaddeus
中科院分区：
文献类型：
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作者：
M. McCarthy;P. Thaddeus
首次观察到纯硅簇（Si3 三聚体）的旋转光谱。从普通同位素以及 29Si 和 30Si 同位素的旋转常数，可以推导出精确的几何结构：三聚体是一个等腰三角形，与顶点 Si 的键长为 2.177(1) A，顶角为 78.10(3) 度。大量的惯性缺陷和相当大的离心变形表明该分子具有浅的弯曲势。 Si3 是天文探测的良好候选者，因为在至少一个天文源中很容易观察到相对质量的硅分子（例如 SiC2、SiC4 和 SiS）的射电线。 Si6、Si9、甚至更大的极性硅团簇以及类似的锗团簇的旋转光谱可以用本技术检测到。
The rotational spectrum of a pure silicon cluster, the Si3 trimer, has been observed for the first time. From the rotational constants of the normal and the 29Si and 30Si isotopic species, a precise geometrical structure has been derived: the trimer is an isosceles triangle with a bond to the apex Si of length 2.177(1) A and an apex angle of 78.10(3) degrees. The substantial inertial defect and fairly large centrifugal distortion suggest that the molecule possesses a shallow bending potential. Si3 is a good candidate for astronomical detection because radio lines of comparably massive silicon molecules (e.g., SiC2, SiC4, and SiS) are readily observed in at least one astronomical source. The rotational spectra of Si6, Si9, and even larger polar silicon clusters may be detectable with the present technique, as well as similar germanium clusters.