Temperature effects on the optical absorption of jellium clusters.
Temperature effects on the optical absorption of jellium clusters.
复制标题
温度对果冻团簇光吸收的影响。
DOI：
10.1103/physrevb.42.5040
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Rubió
中科院分区：
文献类型：
--
作者：
Penzar;Ekardt;Rubió
以${\mathrm{Na}}_{10}$为例，研究了开壳团簇微观光学吸收的温度展宽。所使用的方法是与时间相关的局域密度近似，并结合基态和激发态团簇形状涨落的耦合。与帕切科和布罗利亚早期的研究形成鲜明对比的是，充分考虑了涨落的量子性质。获得的线宽与Knight及其合作者最近的实验数据非常吻合。对所谓的等离激元极近似的破坏进行了详细研究，发现其原因是存储在等离激元线中的振荡器强度的破碎，这在闭壳层果冻团簇(${\mathrm{Na}}_{20}$)和开壳层金属团簇(${\mathrm{Na}}_{10}$)中都是真正的粒子空穴效应。
Temperature broadening of the microscopically obtained optical absorption of open-shell clusters is studied with ${\mathrm{Na}}_{10}$ as an example. The method used is the time-dependent local-density approximation, combined with the coupling to the shape fluctuations of the cluster, both in the ground state and in the excited state. In sharp contrast to earlier studies by Pacheco and Broglia, the quantum nature of the fluctuations is fully taken into account. The obtained linewidth is in good agreement with recent experimental data of Knight and collaborators. The breakdown of the so-called plasmon-pole approximation is investigated in detail, and it is found that the reason for this is the fragmentation of the oscillator strength stored in the plasmon line, which is a genuine particle-hole effect both in closed-shell jellium clusters (${\mathrm{Na}}_{20}$) and in open-shell metal clusters (${\mathrm{Na}}_{10}$).