Temperature relaxation in laser excited aluminium


Temperature relaxation in laser excited aluminium

Vorberger, J.

Energy- and temperature relaxation processes after laser excitation of the electrons in solids and warm dense matter take place in virtually every high-energy density experiment and play an important role in a great number of industrial processes. In inertial fusion, they are essential for a successfull burn phase of the hydrogen pellet. Here, we report on new theoretical and experimental results concerning the energy transfer between electrons and phonons in solid aluminium on a femto to pico-second timescale. The results suggest that the two-temperature model is insufficient to describe the relaxation. We instead introduce a non-thermal lattice model. Within this model, electron-phonon couplings as derived from density functional theory and Bragg-peak decay rates as measured via electron diffraction are consistent with each other.

Keywords: warm dense matter; inertial fusion; energy relaxation; temperature relaxation; energy transfer rate; electron-phonon coupling; two-temperature model

  • Invited lecture (Conferences)
    Seminar der Arbeitsgruppen Quantentheorie und Vielteilchensysteme, Statistische Physik, Molekulare Quantendynamik, Theoretische Clusterphysik und Nanophotonik, 01.12.2015, Rostock, Deutschland

Permalink: https://www.hzdr.de/publications/Publ-22770
Publ.-Id: 22770