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arXiv physics/0112054physics.atm-clus
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Al $_n$ C $^-$团簇的质谱和第一性原理研究

Mass spectrometric and first principles study of Al$_n$C$^-$ clusters

Jijun Zhao, Bingchen Liu, Huajin Zhai, Rufang Zhou, Guoquan Ni, Zhizhan Xu

摘要:

我们利用飞行时间质谱实验和{ \em ab initio}计算研究了碳掺杂铝团簇。得到了阴离子铝和铝碳混合团簇的质量丰度分布。除了Al $_{13}^-$和Al $_{23}^-$这两种著名的“幻”铝团簇外,Al $_7$ C $^-$团簇在Al $_n$ C $^-$中是特别稳定的.用密度泛函方法计算了Al $_n$ C $^-$团簇的基态结构.结果表明,Al $_7$ C $^-$是一种稳定性极高的幻数团簇,可以作为团簇组装材料的结构单元.

英文摘要:

We study the carbon-dope aluminum clusters by using time-of-flight mass spectrum experiments and {\em ab initio} calculations. Mass abundance distributions are obtained for anionic aluminum and aluminum-carbon mixed clusters. Besides the well-known magic aluminum clusters such as Al$_{13}^-$ and Al$_{23}^-$, Al$_7$C$^-$ cluster is found to be particularly stable among those Al$_n$C$^-$ clusters. Density functional calculations are performed to determine the ground state structures of Al$_n$C$^-$ clusters. Our results show that the Al$_7$C$^-$ is a magic cluster with extremely high stability, which might serve as building block of the cluster-assembled materials.

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