Lu Siqi, Xie Lin, Lai Kang, Chen Runkun, Cao Lu, Hu Kuojuei, Wang Xuefeng, Han Jinsen, Wan Xiangang, Wan Jianguo, Dai Qing, Song Fengqi, He Jiaqing, Dai Jiayu, Chen Jianing, Wang Zhenlin, Wang Guanghou
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Physics, Nanjing University, Nanjing 210093, China.
Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
Natl Sci Rev. 2020 Nov 25;8(12):nwaa282. doi: 10.1093/nsr/nwaa282. eCollection 2021 Dec.
The plasmonic response of gold clusters with atom number () = 100-70 000 was investigated using scanning transmission electron microscopy-electron energy loss spectroscopy. For decreasing , the bulk plasmon remains unchanged above = 887 but then disappears, while the surface plasmon firstly redshifts from 2.4 to 2.3 eV above = 887 before blueshifting towards 2.6 eV down to = 300, and finally splitting into three fine features. The surface plasmon's excitation ratio is found to follow , which is essentially . An atomically precise evolution picture of plasmon physics is thus demonstrated according to three regimes: classical plasmon (= 887-70 000), quantum confinement corrected plasmon (= 300-887) and molecule related plasmon (< 300).
利用扫描透射电子显微镜-电子能量损失谱研究了原子数（）= 100 - 70000的金团簇的等离子体响应。对于逐渐减小的，体等离子体在大于887时保持不变，但随后消失，而表面等离子体首先在大于887时从2.4 eV红移至2.3 eV，然后向蓝移至2.6 eV直至 = 300，最后分裂为三个精细特征。发现表面等离子体的激发比遵循，其本质上为。因此，根据三种状态展示了等离子体物理学的原子精确演化图：经典等离子体（= 887 - 70000）、量子限制修正等离子体（= 300 - 887）和分子相关等离子体（< 300）。
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