Development of an experimental apparatus to observe ultrafast phenomena by tender X-ray absorption spectroscopy at PAL-XFEL

Yujin Kim, Daewoong Nam, Rory Ma, Sangsoo Kim, Myung Jin Kim, Jinhong Kim, Intae Eom, Jae Hyuk Lee, Tae Kyu Kim

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1 Citation (Scopus)


Understanding the ultrafast dynamics of molecules is of fundamental importance. Time-resolved X-ray absorption spectroscopy (TR-XAS) is a powerful spectroscopic technique for unveiling the time-dependent structural and electronic information of molecules that has been widely applied in various fields. Herein, the design and technical achievement of a newly developed experimental apparatus for TR-XAS measurements in the tender X-ray range with X-ray free-electron lasers (XFELs) at the Pohang Accelerator Laboratory XFEL (PAL-XFEL) are described. Femtosecond TR-XAS measurements were conducted at the Ru L 3-edge of well known photosensitizer tris­(bi­pyridine)­ruthenium(II) chloride ([Ru(bpy)3]2+) in water. The results indicate ultrafast photoinduced electron transfer from the Ru center to the ligand, which demonstrates that the newly designed setup is applicable for monitoring ultrafast reactions in the femtosecond domain.

Original languageEnglish
Pages (from-to)194-201
Number of pages8
JournalJournal of Synchrotron Radiation
Publication statusPublished - 2022 Jan 1

Bibliographical note

Funding Information:
Funding for this research was provided by: The experiments at the NCI endstation, PAL-XFEL are approved by Korean Synchrotron Users Association and supported by the Ministry of Science and ICT of Republic of Korea (proposal No. 2017-1st-CXI-011, 2018-1st-NCI-006, 2018-2nd-NCI-014). The following funding is acknowledged: Ministry of Science and ICT of Republic of Korea; National Research Foundation of Republic of Korea (NRF-2016K1A4A4A01922028, NRF-2019R1A6B2A02098631, NRF-2018R1D1A1B07049917, NRF-2020R1A4A1017737 and NRF-2021R1F1A1051444). This work was supported by a NRF (National Research Foundation of Korea) Grant funded by the Korean Government (NRF-2018-Global PhD Fellowship Program).

Publisher Copyright:
© 2022 International Union of Crystallography. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation


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