【2h】

Cn(n=2−4): current status

机译:Cn(n = 2-4):当前状态

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摘要

The major aspects of the C2, C3 and C4 elemental carbon clusters are surveyed. For C2, a brief analysis of its current status is presented. Regarding C3, the most recent results obtained in our group are reviewed with emphasis on modelling its potential energy surface which is particularly complicated due to the presence of multiple conical intersections. As for C4, the most stable isomeric forms of both triplet and singlet spin states and their possible interconversion pathways are examined afresh by means of accurate ab initio calculations. The main strategies for modelling the ground triplet C4 potential are also discussed. Starting from a truncated cluster expansion and a previously reported DMBE form for C3, an approximate four-body term is calibrated from the ab initio energies. The final six-dimensional global DMBE form so obtained reproduces all known topographical aspects while providing an accurate description of the C4 linear–rhombic isomerization pathway. It is therefore commended for both spectroscopic and reaction dynamics studies.This article is part of the theme issue ‘Modern theoretical chemistry’.
机译:对C2,C3和C4元素碳簇的主要方面进行了调查。对于C2,将简要分析其当前状态。关于C3,我们回顾了我们小组中获得的最新结果,重点是对其势能面进行建模,由于存在多个圆锥形相交,该势能面特别复杂。对于C4,通过精确的从头算来重新检查三重态和单重态自旋态的最稳定异构形式及其可能的相互转化途径。还讨论了模拟地面三重态C4势的主要策略。从截短的簇扩展和先前报道的C3的DMBE形式开始,从头算能量校准了一个近似的四体项。这样获得的最终六维整体DMBE形式再现了所有已知的地形特征,同时提供了C4线性-斜向异构化途径的准确描述。因此,它对于光谱学和反应动力学研究均受到赞扬。本文是主题“现代理论化学”的一部分。

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