金属纳米团簇的体等离子体光吸收
Photoabsorption by Volume Plasmons in Metal Nanoclusters
摘要：
众所周知，体金属中的等离子体激元不能通过直接光吸收（即，通过体等离子体激元与光的耦合）来激发。在这里，我们证明了相同金属的纳米团簇的情况是完全不同的。我们对Na_（20）和Na_（92）进行了光耗尽测量，发现了一个中心略高于4eV的宽体积等离子体吸收峰，揭示了金属体系中体积型集体电子模光激发的可能性。所观察到的现象与有限系统的不同选择规则有关。
英文摘要：
It is well known that plasmons in bulk metals cannot be excited by direct photoabsorption, that is, by coupling of volume plasmons to light. Here we demonstrate that the situation in nanoclusters of the same metals is entirely different. We have carried out a photodepletion measurement for Na_20 and Na_92 and identified a broad volume plasmon absorption peak centered slightly above 4 eV, revealing the possibility of optical excitation of volume-type collective electronic modes in a metallic system. The observed phenomenon is related to different selection rules for finite systems.
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