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Raman spectroscopic investigation of small matrix-isolated lithium clusters

机译:小型基质分离的锂簇的拉曼光谱研究

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The lithium clusters Li_2,Li_4,and Li_8 have been isolated in argonmatrices at 15 K and characterized by Raman spectroscopy. The vibrational frequencies are compared with configuration interaction (QCISD/6-311G* and CID/6-311G*) calculations and their assignment is supported by 6-lithium and 7-lithium isotopomers. The Li_4 cluster possesses a rhombic structure (D_(2h)) with calculated d(Li-Li)=272.6 and 306.4 pm,respectively. For octalithium,a hypertetrahedral structure (T_d) is predicted in which each side of an inner tetrahedron with d(Li-Li)=292.5 pm is capped by lithium atoms with a distance of d(Li-Li)=304.2 pm. The octalithium cluster is an example of a matrix-isolated magic number cluster.
机译:锂团簇Li_2,Li_4和Li_8已在15 K的氩气中分离,并通过拉曼光谱进行了表征。将振动频率与构型相互作用(QCISD / 6-311G *和CID / 6-311G *)进行了比较,并且它们的分配得到6锂和7锂同位素异构体的支持。 Li_4团簇具有菱形结构(D_(2h)),分别具有计算的d(Li-Li)= 272.6和306.4 pm。对于八烷基,预测了超四面体结构(T_d),其中内部d(Li-Li)= 292.5 pm的四面体的每一侧都被距离d(Li-Li)= 304.2 pm的锂原子覆盖。八al簇是矩阵隔离的幻数簇的一个示例。

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