中南民族大学学报（自然科学版）2011，Vol.30Issue(1)：59-63,5.
钠纳米团簇的光吸收和体等离激元:理论分析
Photoabsorption of Nan Clusters and Volume Plasmon: Theory Review
夏春雷1
作者信息
- 1. 美国纽约高盛集团,纽约,10018-1405
- 折叠
摘要
Abstract
The volume plamson is an important elementary excitation,it could not couple to lightwaves in the bulk and thus could not be investigated by optical spectroscopy,however the situation is different for clusters due to the presence of the boundary.What is more,it is fundamental to study the interaction between light and matter,but the photoabsorption of simple metal clusters in the UV region has remained unexplored experimentally.We have carried out experiments on the photoabsorption of Na20and Na92 covering the near UV part as well as visible range (2.0～5.5 eV)employing the phorodepletion technique.The absorption cross sections for clusters of some other sizes in the near UV range have also been studied.The experimental data for Na20 in the visible part agree with existing data very well.In addition to the strong surface plasmon absorption peaks in the visible,we observed appreciable photoabsorption in the UV region.These cross section spectra have been fitted by Lorentzian line shapes and revealed broad peaks slightly above 4 eV.The frequency and weight of these peaks match the theoretical predictions and are identified as the nanocluster"volume plasmon"resonance.The photoabsorption spectra provide the first experimental observation of optically excited"volume plasmon"collective electronic states in metal nanocluster particles,a phenomenon unique to finite systems.关键词
纳米团簇/体等离激元/表面等离激元/光吸收Key words
nanocluster/volume plasmon/surface plasmon/photoabsorption分类
化学化工引用本文复制引用
夏春雷..钠纳米团簇的光吸收和体等离激元:理论分析[J].中南民族大学学报（自然科学版）,2011,30(1):59-63,5.
