Resonance Raman excitation and electronic structure of the single bonded dimers (C ¯60)2 and (C 59N)2
Resonance Raman excitation and electronic structure of the single bonded dimers (C ¯60)2 and (C 59N)2
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单键二聚体 (C 60)2 和 (C 59N)2 的共振拉曼激发和电子结构
DOI：
10.1007/s100510070157
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Prassides
中科院分区：
文献类型：
--
作者：
W. Plank;T. Pichler;H. Kuzmany;O. Dubay;N. Tagmatarchis;K. Prassides
给出了单键二聚富勒烯（C60-）2的拉曼光谱，并与等结构和等电子杂富勒烯（C59N）2的光谱和拉曼光谱进行了比较。两种材料的光谱都与分裂、线的位置和线的强度有很强的相关性。这适用于蓝色和绿色激光的非共振激发以及用红色激光观察到的强共振。与C60相比，后一种观测结果与电子跃迁能量的下降相一致。在1.4 eV处发现了（C59N）2薄膜的吸收边。（C59N）2和（C60-）2分别在82,103和111 cm-1和88,98和106 cm-1处观察到三种笼间模式。对于（C59N）2和（C60-）2，分别在1461和1451 cm-1处观察到的两种材料中的五边形捏缩模式的位置存在惊人的差异。这被解释为两种化合物的电子结构的某些特征差异的结果。
Raman spectra are presented for the single bonded dimeric fullerene (C60-)2and compared to optical spectra and Raman spectra of the isostructural and isoelectronic heterofullerene (C59N)2. The spectra of both materials exhibit strong correlations with respect to splitting, line position, and line intensity. This holds for non resonant excitation with blue and green lasers as well as for the strong resonances observed with red lasers. The latter observation is consistent with a downshift for the electronic transition energies as compared to C60. The absorption edge of thin films of (C59N)2was found at 1.4 eV. The three intercage modes were observed at 82, 103, and 111, and at 88, 98, and 106 cm-1for (C59N)2and (C60-)2, respectively. A surprising difference was found for the position of the pentagonal pinch modes in the two materials as they were observed at 1461 and at 1451 cm-1, for (C59N)2and (C60-)2, respectively. This is interpreted as a consequence of some characteristic differences in the electronic structure of the two compounds.