A femtosecond time-resolved Bragg coherent diffraction imaging experimental setup at PAL-XFEL for nanoscale lattice dynamics studies

Kang, J.; Park, J.; Shim, C.H.; Cho, M.-H.; Moon, K.-J.; Ha, S.S.; Kim, H.; Cho, S.-L.; Kim, S.

doi:10.1107/S1600577526007927

Figure 2
Time-resolved evolution of the Bi (003) Bragg peak intensity with its corresponding fitting curve. Data were acquired using a 266 nm optical pump (2 mJ cm⁻²) and a CRL-focused 9.0 keV XFEL probe (∼30 fs). The fit yields a coherent phonon frequency of 2.71 T Hz, demonstrating an experimental timing precision of <60 fs. The extracted best-fit parameters are as follows: instrument response width = 0.0995 ps, oscillatory amplitude = 0.1902, coherent phonon frequency = 2.7095 THz, and decay lifetime = 0.8570 ps.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 33| Part 6| November 2026|

https://doi.org/10.1107/S1600577526007927

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