Temperature Dependence of the Optical Response of Small Sodium Clusters

Details Temperature Dependence of the Optical Response of Small Sodium Clusters Temperature Dependence of the Optical Response of Small Sodium Clusters

1995-04-11

arxiv.org/abs/chem-ph/9504001v1

Physics

Chemical Physics

9 pages, Revtex, 3 uuencoded postscript figures

Scientific paper

10.1209/0295-5075/31/9/003

We present an analysis of the temperature dependence of the optical response of small sodium clusters in a temperature range bracketing the melting phase transition. When the temperature increases, the mean excitation energy undergoes a red shift and the plasmon is significantly broadened, in agreement with recent experimental data. We show that the single--particle levels acquire a prominent width and the HOMO--LUMO gap as well as the width of the occupied band are reduced due to large thermal cluster size and shape fluctuations. This results in a sharp increase of the static polarizability with temperature.

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