Measurement of Electron-Ion Relaxation in Warm Dense Copper

B I Cho; T Ogitsu; K Engelhorn; A A Correa; Y Ping; J W Lee; L J Bae; D Prendergast; R W Falcone; P A Heimann

doi:10.1038/srep18843

Measurement of Electron-Ion Relaxation in Warm Dense Copper

Sci Rep. 2016 Jan 6:6:18843. doi: 10.1038/srep18843.

Authors

B I Cho^{1

2}, T Ogitsu³, K Engelhorn⁴, A A Correa³, Y Ping³, J W Lee^{1

2}, L J Bae^{1

2}, D Prendergast⁵, R W Falcone⁶, P A Heimann⁷

Affiliations

¹ Center for Relativistic Laser Science, Institute for Basic Science (IBS), Gwangju, 500-712, Korea.
² Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, Korea.
³ Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
⁴ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
⁵ Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
⁶ Department of Physics, University of California, Berkeley, CA 94720, USA.
⁷ Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.

Abstract

Experimental investigation of electron-ion coupling and electron heat capacity of copper in warm and dense states are presented. From time-resolved x-ray absorption spectroscopy, the temporal evolution of electron temperature is obtained for non-equilibrium warm dense copper heated by an intense femtosecond laser pulse. Electron heat capacity and electron-ion coupling are inferred from the initial electron temperature and its decrease over 10 ps. Data are compared with various theoretical models.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.