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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Temperature and size dependence of the optical response of small Ag_n clusters
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Temperature and size dependence of the optical response of small Ag_n clusters

机译：Ag_n小团簇的光学响应的​​温度和尺寸依赖性

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摘要

The absorption spectra of small Ag_n~+ clusters are calculated at finite vibrational temperature by using a microscopic tight-binding RPA method. We consider free clusters with sizes between n = 3 and n = 13 and take into account explicitly the degrees of freedom corresponding to the 4d-electrons. We analyze the optical absorption as a function of the cluster size. We show that the contribution of the d-electrons has an important influence on the size dependence of the energy of the Mie plasmon. We also perform ensemble averages to obtain the absorption spectra for different vibrational temperatures. We obtain relatively good agreement with experiment for a temperature T approx 500 K. the dynamics of the 4d-electrons, which shows in small clusters an incipient delocalized character for n > 7, yields an important contribution to the absorption spectrum already for n = 13. We find that the strength of this contribution can be controlled by varying the vibrational temperature.
机译：利用微观紧密结合RPA法在有限的振动温度下计算了Ag_n〜+小团簇的吸收光谱。我们考虑大小在n = 3和n = 13之间的自由簇，并明确考虑了与4d电子相对应的自由度。我们分析了光吸收与团簇大小的关系。我们表明，d电子的贡献对米氏等离子体激元的能量的尺寸依赖性有重要影响。我们还执行集合平均，以获得不同振动温度下的吸收光谱。我们在温度约为500 K的温度下与实验获得了相对较好的一致性。4d电子的动力学在小簇中显示了n> 7的初始离域特征，这已经对n = 13时的吸收光谱产生了重要贡献我们发现可以通过改变振动温度来控制这种作用的强度。

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