Spectroscopy of extremely cold silver clusters in helium droplets

被引：60

作者：

Federmann, F ^{[1
]}

Hoffmann, K ^{[1
]}

Quaas, N ^{[1
]}

Toennies, JP ^{[1
]}

机构：

[1] Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany

来源：

EUROPEAN PHYSICAL JOURNAL D | 1999年 / 9卷 / 1-4期

关键词：

D O I：

10.1007/PL00010922

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The first highly resolved electronic spectra of small non-alkali metal clusters embedded in nanoscopic helium droplets (N approximate to 20000) are presented. The helium droplets serve as an extremely cold liquid matrix with a temperature of 0.37 K. Resonant two-photon-ionization is used for size-selective spectroscopy on a silver cluster distribution (N less than or equal to 10). Results are reported for Ag-2, Ag-3 and for Ag-8. For the latter, a very narrow absorption spectrum is resolved corresponding to the Ag-8 plasmon resonance. The linewidth of the observed resonance is a factor of two smaller than theoretical zero-temperature predictions for the plasmon line width of closed-shell metal clusters. In contrast, the lifetime of the Ag-8 resonance is estimated to be of the order of nanoseconds, which is inconsistent with the plasmon picture and typical for molecular transitions.

引用

页码：11 / 14

页数：4

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