title: Electronic structure of warm dense copper studied by ultrafast x-ray absorption spectroscopy.
abstract: We use time-resolved x-ray absorption spectroscopy to investigate the unoccupied electronic density of states of warm dense copper that is produced isochorically through the absorption of an ultrafast optical pulse. The temperature of the superheated electron-hole plasma, which ranges from 4000 to 10 000 K, was determined by comparing the measured x-ray absorption spectrum with a simulation. The electronic structure of warm dense copper is adequately described with the high temperature electronic density of state calculated by the density functional theory. The dynamics of the electron temperature is consistent with a two-temperature model, while a temperature-dependent electron-phonon coupling parameter is necessary.
authors: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors: B I
authors: BI
authors: Cho
authors: K
authors: K
authors: Engelhorn
authors: A A
authors: AA
authors: Correa
authors: T
authors: T
authors: Ogitsu
authors: C P
authors: CP
authors: Weber
authors: H J
authors: HJ
authors: Lee
authors: J
authors: J
authors: Feng
authors: P A
authors: PA
authors: Ni
authors: Y
authors: Y
authors: Ping
authors: A J
authors: AJ
authors: Nelson
authors: D
authors: D
authors: Prendergast
authors: R W
authors: RW
authors: Lee
authors: R W
authors: RW
authors: Falcone
authors: P A
authors: PA
authors: Heimann