COLLECTIVE DIPOLE OSCILLATIONS IN SMALL SODIUM CLUSTERS
COLLECTIVE DIPOLE OSCILLATIONS IN SMALL SODIUM CLUSTERS
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DOI：
10.1103/physrevlett.59.1805
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发表时间：
1987-10-19
影响因子：
8.6
通讯作者：
KNIGHT, WD
中科院分区：
文献类型：
--
作者：
DEHEER, WA;SELBY, K;KNIGHT, WD
用纵向光束耗尽光谱法测量了N= 2-40个钠原子组成的小中性钠簇在不同波长可见光下的光吸收截面。吸收是通过光子与价电子的集体振荡耦合发生的。横截面与尺寸和波长密切相关。与基于扩展Clemenger-Nilsson壳模型和实验静态极化率的预测结果吻合较好。
Photoabsorption cross sections of small neutral sodium clusters composed of N= 2–40 sodium atoms are measured by longitudinal–beam-depletion spectroscopy at several wavelengths of visible light. Absorption occurs via coupling of photons to collective oscillations of the valence electrons. The cross section is strongly size and wavelength dependent. Good agreement is found with predictions based on an extended Clemenger-Nilsson shell model and the experimental static polarizabilities.