AI Article Synopsis
- The study investigates how ultrafast heating occurs in cryogenic hydrogen when exposed to a short (less than 300 fs) 92 eV x-ray pulse.
- The results show that the transition from dense molecular hydrogen to a plasmalike state happens within approximately 0.9 picoseconds, suggesting how quickly the electrons and ions reach equilibrium.
- These findings align with radiation hydrodynamics simulations that utilize a conductivity model for partially ionized plasma, further supported by density-functional theory.
Article 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.
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| http://dx.doi.org/10.1103/PhysRevLett.112.105002 | DOI Listing |
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