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As an elementary type of collective excitation, plasmon has been found to dominate the optical properties of metals. The collective behavior of electrons in plasmons reflects the important difference between condensed matter and molecule-like ones. It is of great significance to study the evolution of plasmonic response and find out the boundary.
Controversy exists on such interesting questions as the division between the nanoparticle and molecules, and the physics of mesoscopic and microscopic plasmonic evolution. A unified understanding covering the small and large size limit, namely macro / meso / micro scales with sufficiently atomic precision is thus required. Clusters, as the transition from atomic molecules to condensed matter, are the ideal candidate for studying the evolution of plasmons.