U. Zastrau,
P. Sperling,
M. Harmand,
A. Becker,
T. Bornath,
R. Bredow,
S. Dziarzhytski,
T. Fennel,
L. Fletcher,
E. Förster,
S. Göde,
G. Gregori,
V. Hilbert,
D. Hochhaus,
B. Holst,
T. Laarmann,
H. Lee,
T. Ma,
J. Mithen,
R. Mitzner,
C. Murphy,
M. Nakatsutsumi,
P. Neumayer,
A. Przystawik,
S. Roling,
M. Schulz,
B. Siemer,
S. Skruszewicz,
J. Tiggesbäumker,
S. Toleikis,
T. Tschentscher,
T. White,
M. Wöstmann,
H. Zacharias,
T. Döppner,
S. Glenzer,
and R. Redmer
Resolving Ultrafast Heating of Dense Cryogenic Hydrogen
Phys. Rev. Lett., 112 :105002 (March 2014)
Resolving Ultrafast Heating of Dense Cryogenic Hydrogen
Phys. Rev. Lett., 112 :105002 (March 2014)
Abstract:
We report on the dynamics of ultrafast heating in cryogenic hydrogen initiated by a ≲300 fs, 92 eV free electron laser x-ray burst. The rise of the x-ray scattering amplitude from a second x-ray pulse probes the transition from dense cryogenic molecular hydrogen to a nearly uncorrelated plasmalike structure, indicating an electron-ion equilibration time of ∼0.9 ps. The rise time agrees with radiation hydrodynamics simulations based on a conductivity model for partially ionized plasma that is validated by two-temperature density-functional theory.