Resolving ultrafast heating of dense cryogenic hydrogen.

Resolving ultrafast heating of dense cryogenic hydrogen.

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...

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Bibliographic Details
Main Authors: Zastrau, U, Sperling, P, Harmand, M, Becker, A, Bornath, T, Bredow, R, Dziarzhytski, S, Fennel, T, Fletcher, L, Förster, E, Göde, S, Gregori, G, Hilbert, V, Hochhaus, D, Holst, B, Laarmann, T, Lee, H, Ma, T, Mithen, J, Mitzner, R, Murphy, C, Nakatsutsumi, M, Neumayer, P, Przystawik, A, Roling, S
Format: Journal article
Language:English
Published: American Physical Society 2014
Description
Summary: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.

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