Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics

Abstract : We present measurements of photon absorption by free electrons as a solid is transformed to plasma. A femtosecond x-ray free-electron laser is used to heat a solid, which separates the electron and ion heating time scales. The changes in absorption are measured with an independent probe pulse created through high-order-harmonic generation. We find an increase in electron temperature to have a relatively small impact on absorption, contrary to several predictions, whereas ion heating increases absorption. We compare the data to current theoretical and numerical approaches and find that a smoother electronic structure yields a better fit to the data, suggestive of a temperature-dependent electronic structure in warm dense matter.
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https://hal-cea.archives-ouvertes.fr/cea-01741518
Contributor : Caroline Lebe <>
Submitted on : Friday, March 23, 2018 - 11:04:39 AM
Last modification on : Monday, September 2, 2019 - 5:32:02 PM

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Gareth O. Williams, S. Künzel, S. Daboussi, B. Iwan, A. Gonzalez, et al.. Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics. Physical Review A, American Physical Society, 2018, 97 (2), ⟨10.1103/PhysRevA.97.023414⟩. ⟨cea-01741518⟩

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