Record Details

Title:
Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument HED
Topic:
Scientific area:
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.
Imprint:
2018
Journal Information:
Physical Review A: Atomic, Molecular, and Optical Physics, 97 (2), 023414 (2018)
Related external records:
Language(s):
English


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 Record created 2018-03-05, last modified 2019-01-30

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