Dielectric function of warm dense gold

被引:17
|
作者
Ping, Y. [1 ]
Hanson, D. [2 ]
Koslow, I. [2 ]
Ogitsu, T. [1 ]
Prendergast, D. [3 ]
Schwegler, E. [1 ]
Collins, G. [1 ]
Ng, A. [1 ,2 ]
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V5Z 1M9, Canada
[3] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1063/1.2844365
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Single-state measurements of the broadband (450-800 nm) dielectric function of gold using a supercontinuum probe are reviewed. These measurements have demonstrated the first evidence of the existence of band structure in ultrathin gold foils isochorically heated by a femtosecond laser pulse to energy densities of 10(6)-10(7) J/kg. The Drude component of the dielectric function increases with energy density while the interband component shows both enhancement and redshift. Ab initio molecular-dynamics calculations based on thermalized electrons cannot reproduce the experimental results, suggesting a non-Fermi distribution of excited electrons. (C) 2008 American Institute of Physics.
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页数:7
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