4.2 Article

Femtosecond soft X-ray absorption spectroscopy of warm dense matter at the PAL-XFEL

Journal

JOURNAL OF SYNCHROTRON RADIATION
Volume 27, Issue -, Pages 953-958

Publisher

INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S160057752000524X

Keywords

X-ray free electron lasers; X-ray absorption spectroscopy; warm dense matter

Funding

  1. Institute for Basic Science [IBS-R012-D1]
  2. National Research Foundation of Korea [NRF-2015R1A5A1009962, NRF-2019R1A2C2002864, NRF-2019K2A9A2A08000160, NRF-2018R1D1A1B07046676]
  3. National Research Foundation of Korea [10Z20130012677] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Free-electron laser pulse-based X-ray absorption spectroscopy measurements on warm dense copper are presented. The incident X-ray pulse energies were measured with a detector assembly consisting of a photocathode membrane and microchannel plates, and the transmitted energies were measured simultaneously with a photodiode detector. The precision of the absorption measurements was evaluated. For a warm dense copper foil irradiated by an intense femtosecond laser pulse, the enhanced X-ray absorption below the L-3-edge, followed by the rapid evolution of highly excited Fermi liquid within a picosecond, were successfully measured. This result demonstrates a unique capability to study femtosecond non-equilibrium electron-hole dynamics in extreme states of matter.

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