Department of Physics and Astronomy, Uppsala University, Box 530, Uppsala, Sweden.
J Chem Phys. 2011 Mar 7;134(9):094511. doi: 10.1063/1.3563751.
Plasmons are investigated in free nanoscale Na, Mg, and K metal clusters using synchrotron radiation-based x-ray photoelectron spectroscopy. The core levels for which the response from bulk and surface atoms can be resolved are probed over an extended binding energy range to include the plasmon loss features. In all species the features due to fundamental plasmons are identified, and in Na and K also those due to either the first order plasmon overtones or sequential plasmon excitation are observed. These features are discussed in view of earlier results for planar macroscopic samples and free clusters of the same materials.
采用基于同步辐射的 X 射线光电子能谱研究了自由纳米尺度的 Na、Mg 和 K 金属团簇中的等离子体。在扩展的结合能范围内探测到可以分辨出体原子和表面原子响应的芯能级，以包括等离子体损耗特征。在所有物种中都识别出了基本等离子体的特征，在 Na 和 K 中还观察到了一阶等离子体泛音或顺序等离子体激发的特征。这些特征是根据先前对于平面宏观样品和相同材料的自由团簇的结果进行讨论的。
