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Observation of ultrafast nonequilibrium collective dynamics in warm dense hydrogen.

Fäustlin, RR, Bornath, T, Döppner, T, Düsterer, S, Förster, E, Fortmann, C, Glenzer, SH, Göde, S, Gregori, G, Irsig, R , Laarmann, T, Lee, HJ, Li, B, Meiwes-Broer, KH, Mithen, J, Nagler, B, Przystawik, A, Redlin, H, Redmer, R, Reinholz, H, Röpke, G, Tavella, F, Thiele, R, Tiggesbäumker, J, Toleikis, S, Uschmann, I, Vinko, SM, Whitcher, T, Zastrau, U, Ziaja, B and Tschentscher, T (2010) Observation of ultrafast nonequilibrium collective dynamics in warm dense hydrogen. Phys Rev Lett, 104 (12).

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We investigate ultrafast (fs) electron dynamics in a liquid hydrogen sample, isochorically and volumetrically heated to a moderately coupled plasma state. Thomson scattering measurements using 91.8 eV photons from the free-electron laser in Hamburg (FLASH at DESY) show that the hydrogen plasma has been driven to a nonthermal state with an electron temperature of 13 eV and an ion temperature below 0.1 eV, while the free-electron density is 2.8x10{20} cm{-3}. For dense plasmas, our experimental data strongly support a nonequilibrium kinetics model that uses impact ionization cross sections based on classical free-electron collisions.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Fäustlin, RR
Bornath, T
Döppner, T
Düsterer, S
Förster, E
Fortmann, C
Glenzer, SH
Göde, S
Gregori, G
Irsig, R
Laarmann, T
Lee, HJ
Li, B
Meiwes-Broer, KH
Nagler, B
Przystawik, A
Redlin, H
Redmer, R
Reinholz, H
Röpke, G
Tavella, F
Thiele, R
Tiggesbäumker, J
Toleikis, S
Uschmann, I
Vinko, SM
Whitcher, T
Zastrau, U
Ziaja, B
Tschentscher, T
Date : 26 March 2010
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:27
Last Modified : 24 Jan 2020 22:18

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