Collective excitations in the electron energy loss spectra of C60
Collective excitations in the electron energy loss spectra of C60
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DOI：
10.1140/epjd/e2012-30178-1
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
P. Bolognesi;L. Avaldi;Alessandro Ruocco;A. Verkhovtsev;A. Verkhovtsev;A. Korol;A. Solov'yov
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文献类型：
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作者：
P. Bolognesi;L. Avaldi;Alessandro Ruocco;A. Verkhovtsev;A. Verkhovtsev;A. Korol;A. Solov'yov
给出了C60富勒烯能量损失谱中集体激发的实验和理论研究结果。随着散射角的增加，实验上观察到电子能量损失谱的形状发生变化。这种变化被描述在一个新的理论模型的框架内，该模型将富勒烯作为一个有限宽度的球壳，并占两种模式的表面等离子体和体积等离子体。结果表明，在小角度的非弹性散射截面主要是由表面等离子体激元的对称模式的激发，而在较大的角度的反对称表面和体积等离子体激元的激发变得突出。
The results of a joint experimental and theoretical investigation of the collective excitations in the energy loss spectra of the C60fullerene are presented. A variation of the shape of the electron energy loss spectrum has been observed experimentally as the scattering angle increases. This variation is described within the frame of a new theoretical model which treats the fullerene as a spherical shell of a finite width and accounts for the two modes of the surface plasmon and for the volume plasmon as well. It is shown that at small angles the inelastic scattering cross section is determined mostly by the excitation of the symmetric mode of the surface plasmon, while at larger angles the excitation of the antisymmetric surface and volume plasmons becomes prominent.