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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Electronic relaxation in Ag nanoclusters studied with time-resolved photoelectron spectroscopy
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Electronic relaxation in Ag nanoclusters studied with time-resolved photoelectron spectroscopy

机译：用时间分辨光电子能谱研究银纳米团簇中的电子弛豫

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The decay mechanism of excited electronic states in small Ag nanoclusters is studied using time-resolved photoelectron spectroscopy. The low density of states in these clusters inhibits Auger-like decay channels that are responsible for ultrafast relaxation of optically excited states in bulk Ag. Thus, much longer relaxation times are expected for small clusters showing large gaps between electronic states. In contrast to this expectation, lifetimes below 1 ps were observed for most of the Ag_n~ - (n < 22) studied here. The only exception is the magic Ag_7~ - with a relaxation time of 3.8 ps. The observed fast relaxations are discussed in view of their ability to undergo fast shape deformations. This approach can also explain the slow relaxation of the rigid Au_n~-nanoclusters and the extremely fast relaxation of the flexible magic Al_(13)~-.
机译：利用时间分辨光电子能谱研究了小型Ag纳米团簇中激发电子态的衰减机理。这些簇中态的低密度抑制了像俄歇（Auger）一样的衰变通道，这些通道负责散装Ag中光学激发态的超快松弛。因此，对于在电子状态之间显示较大间隙的小簇，期望更长的弛豫时间。与此预期相反，此处研究的大多数Ag_n〜-（n <22）的寿命均低于1 ps。唯一的例外是魔术Ag_7〜-松弛时间为3.8 ps。考虑到其快速变形的能力，对讨论的快速松弛进行了讨论。这种方法还可以解释刚性Au_n〜-纳米簇的缓慢弛豫和柔性魔术Al_（13）〜-的极快弛豫。

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